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Scientist

1452

April 15

on Thursday

Leonardo da Vinci is born out of wedlock to a notary, Ser Piero da Vinci, and a peasant woman, Caterina, in Vinci.

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Astronomical Events

The moon was waning crescent that night.
Sunrise in Vinci was at 5:56 AM and sunset was at 6:03 PM.

1452

April 15

on Thursday

The event of Leonardo da Vinci's birth was recorded by his grandfather, Antonio, then about eighty years old, on the back page of an old notebook that had once belonged to his grandfather. On it he had already noted the births and baptisms of his own four children. There was just room at the bottom of the page to record this new arrival, this new generation -

  1. There was born to me a grandson, the son of Ser Piero my son, on the 15th day of April, a Saturday, at the 3rd hour of the night. He bears the name Lionardo.

The clock was then reckoned from sunset (or more precisely from the ringing of the Ave Maria bell after vespers). The third hour of the night was about 10:30 p.m.

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Astronomical Events

The moon was waning crescent that night.

1467

14 years, 8 months, 24 days later

Leonardo's apprenticeship

Leonardo da Vinci is sent to Florence to work as apprentice to Andrea del Verrocchio.

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Leonardo in Verrocchio's studio painting his parts of 'The Baptism of Christ'

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1472

5 years, 1 day later

Leonardo da Vinci paints The Annunciation for the Olivetan monastery of San Bartolomeo, near Florence.

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Source: Primary

Luke Syson; Syson, Luke; Larry Keith, Arturo Galansino, Antoni Mazzotta, Scott Nethersole and Per Rumberg (2011). "Leonardo da Vinci: Painter at the Court of Milan". London: National Gallery

1472

July 1

on Monday

6 months, 2 days later

In the summer of 1472, at the age of twenty, Leonardo was registered as a member of the Florentine painters' confraternity, the Compagnia di San Luca. The company's ledgers record that

Lyonardo di Ser Piero da Vinci dipintore' was charged 32 soldi for the privilege of membership.

This included 16 soldi for his annual subscription, to be paid in monthly instalments from 1 July 1472, and 10 soldi as a contribution to the company's observances on the feast day of Saint Luke, 18 October.

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The moon was waning crescent that night.

1473

6 months, 4 days later

Leonardo da Vinci paints The Annunciation for the Olivetan monastery of San Bartolomeo, near Florence.

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Source: Primary

Martin Kemp; "Leonardo: Revised edition". Oxford: Oxford University Press, 2011.

1473

August 5

on Tuesday

7 months, 6 days later

Leonardo da Vinci produces a pen and ink drawing of the Arno valley that is dated to this day. It is said to be one of the earliest Italian landscape drawings that focuses on the particular character of the location.

The drawing is said by some scholars to be a study intended for the 'Baptism of Christ', which Leonardo painted with Andrea del Verrocchio around this time.

Attachments
Drawing of the Arno valley by Leonardo da Vinci
Landscape from 'Baptism of Christ'

Astronomical Events

The moon was waxing gibbous that night.
Sunrise in Arno was at 6:01 AM and sunset was at 6:08 PM.

Source: Primary

https://en.wikipedia.org/wiki/Leonardo_da_Vinci

1474

4 months, 29 days later

The Baptism of Christ

Andrea del Verrocchio, with a young Leonardo da Vinci, paints The Baptism of Christ.

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1476

2 years later

The Portinari Altarpiece by Hugo van der Goes arrives in Florence, bringing new painterly techniques from Northern Europe which were to profoundly affect Leonardo, Ghirlandaio, Perugino and others.

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Agents

Domenico Ghirlandaio (1449-1494), aged 27: painter
Perugino (1446-1523), aged 30: painter

1476

Accusations of sodomy

Leonardo da Vinci is anonymously accused, along with three others, of committing sodomy with Jocopo Salterelli (a 17-year-old part-time model in Verrocchio’s studio).

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Leonardo (far right) and others in court on charges of sodomy
The magistrates discuss the case of young Florentines, including Leonardo, who were anonymously accused of sodomy

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1478

2 years, 1 day later

Leonardo da Vinci writes in his notebooks that he has begun "two Virgin Marys."

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1478

Leonardo da Vinci leaves Verrocchio's studio and is no longer resident at his father's house.

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1478

January

Leonardo da Vinci receives a commission to paint an altarpiece for the Chapel of the Signoria in the Palazzo Vecchio.

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1480

2 years later

The Anonimo Gaddiano claims that Leonardo da Vinci is living with the Medici and working in the Garden of the Piazza San Marco in Florence, a Neo-Platonic academy of artists, poets and philosophers.

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1481

1 year, 1 day later

Draft of a letter from Leonardo da Vinci to Ludovico Sforza:

Your Gracious Highness! I have sufficiently seen and tested the productions of all who are considered masters of the art of inventing war-machines. And since the working and function of these instruments is no different from that of the machines in common use, I shall endeavour -- approaching no one else -- to make myself clear to Your Excellency and reveal my secrets. I shall put them at your disposal whenever you desire and hope for good results from the things which I shall now briefly describe ...

First: I have a means of making very light bridges which can be very easily transported ... And I have others which are proof against fire and are thus indestructible in battle, easy to take down and put up again, and I also know of a means to get fire to the bridges of the enemy and destroy them. Secondly: In besieging a place I know how to cut off the water in the dikes, also how to construct many drawbridges and other apparatus necessary for such an undertaking. Thirdly: If during a siege the engines cannot be effectively used on account of the height or strength of the town wall, I have a means to destroy every tower or fortification ... Fourthly: I know of a kind of siege-engine which is very light and easy to move and which can be used hurl fire-bombs. Their smoke will terrify, confuse and severely injure the enemy. Fifthly: I know how to construct subterranean caves and winding passages which can be made without any noise ... Sixthly: I can make sound, indestructible armoured vehicles. If these reach the enemy with their cannons, they can compel the largest forces to retreat and afterwards the infantry can follow them in safety and without any let or hindrance. Seventhly: I can make, if necessary, bombards, mortars and other field-guns ... Eighthly: Where cannons cannot be used I shall construct stone-throwing machines, catapults, slings and other instruments, amazing and hitherto completely unknown ... Ninthly: If this should be necessary, I know of apparatus for use at sea for attack and defence, such as ships which can withstand the force of the strongest opponents and produce dust and smoke. In time of peace I believe I can achieve something in architecture, as well as another, both in building public and private buildings and in channelling water from one place to another. Further, I work as a sculptor in marble, bronze and clay and can paint as well as others with whom I may be compared. I could also add my labours to the bronze horse which is to contribute to the undying fame and eternal memory of your father and the renowned house of Sforza ...

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Source: Primary

Leonardo da Vinci; 'Letters of the Great Artists', p. 34-8

1481

March

1 month, 29 days later

Leonardo da Vinci receives a commission to paint The Adoration of the Magi for the Monks of San Donato a Scopeto, which he leaves unfinished.

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1482

10 months, 6 days later

According to Vasari, Leonardo da Vinci, who is a talented musician, creates a silver lyre in the shape of a horse's head.

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1482

Leonardo da Vinci moves to Milan to work in the service of the city's duke, Ludovico Sforza. He gains the title of "painter and engineer" of the duke.

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1483

1 year later

Leonardo da Vinci makes a sketch of the design for the Arial Screw while in Milan.

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1483

April 25

on Wednesday

3 months, 24 days later

Leonardo da Vinci accepts the commission for an altar painting offered by the confraternity of the Immaculate Conception, which had a chapel in the now demolished church of San Francesco Grande in Milan.

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Astronomical Events

The moon was waning gibbous that night.

1483

December 3

on Monday

7 months, 12 days later

Leonardo da Vinci agrees to deliver the Virgin of the Rocks to the confraternity in time for the Feast of the Conception of that year.

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Astronomical Events

The moon was waxing crescent that night.

1486

2 years, 1 month later

Leonardo da Vinci delivers The Virgin of the Rocks to the Confraternity of the Immaculate Conception, three years later than contractually agreed.

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1488

Late

2 years, 5 months, 2 days later

Leonardo da Vinci begins working on the apparatus for the festival celebrating the marriage of Gian Galeazo Sforza to Isabella of Aragon.

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1489

7 months, 4 days later

Leonardo da Vinci receives the Sforza commission from Ludovico Sforza, to cast the largest equestrian statue ever, in honour of Ludovico's father.

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1489

Leonardo da Vinci studies anatomy.

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1489

July 21

on Sunday

6 months, 21 days later

They began to build the walls upon the aforesaid foundations.

And at this time the following buildings were erected:

The Osservanza di San Miniato de' Frati di San Francesco(1); the sacristy of Santo Spirito; the house of Giulio Gondi(2); and the church of the Frati di Sant' Agonstino,(3) outside the Porta a San Gallo. And Lorenzo de' Medici began a palace at the Poggio a Caiano, on his property, where so much has been beautifully ordered, the Cascine, etc. Princely things! At Sarrezana a fortress was built; and many other houses were erected in Florence: in the street which goes to Santa Caterina, and towards the Porta a Pinti, and the Via Nuova de' Servi, at Cestello,(4) and from the Porta a Faenza(5) towards San Barnaba, and towards Sant' Ambrogio, and elsewhere. Men were crazy about building at this time, so that there was a scarcity of master-builders and of materials.(6)

(1) The monastery (lately built near San Miniato) of the Osservanza, a Franciscan Order, who already had one at Fiesole. (Trans.)

(2) In our days we have just seen this palace completed on its southern side, thanks to the care of its owner. In finishing this work the remains of the house opposite in Via de' Gondi were demolished; this used to be the Casa della Dogana, and in still older times the Casa delle Prestanze, that Giuliano Gondi bought from the Arte della Lana (Guild of Wool) to use in his building, and in it Leonardo da Vinci lived as a boy, a fact which I was the first to prove in July 1872.

(3) Chiesa di Sant' Agonstino. In the siege of 1529 it was demolished together with the convent which was united to it. They occupied almost the same area as the parterre and oratory of the Madonna delle Tosse. The monks were moved into the city, where they were given the church of S. Jacopo tra' Fossi.

(4) Cestello was at that time the name of the present convent of S. Maria Maddalena in Borgo Pinto, which belonged to the Cistercians. In 1628 they exchanged it for that of the nuns of S. Maria degli Angeli of Borgo S. Frediano, still called S. Maria Maddalena de' Pazzi.

(5) See note to 8th June, 1481.

(6) In May 1489 the Signoria, desirous of providing for the beauty of the city, and for the wants and convenience of those who might wish to inhabit it, granted an exemption for forty years from any tax for those new houses which should be built within five years "in places where there was no house or any beginning of one." In March 1494 this term was prolonged to the end of the year 1497.

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Astronomical Events

The moon was in the last quarter that night.
Sunrise in Fiesole was at 6:01 AM and sunset was at 6:08 PM.

1489

July 22

on Monday

1 day later

Impatient with Leonardo's delays in completing the clay model for the The Horse, Ludovico Sforza writes to Pietro Alemanni, the Florentine Ambassador to Milan, asking him to find "a master capable of doing the work."

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Astronomical Events

The moon was waning crescent that night.

1489

August 31

on Saturday

1 month, 10 days later

Leonardo da Vinci asks Platino Plato, orator and poet, for an epigram to put on The Horse.

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Astronomical Events

The moon was waxing crescent that night.

1489

Late

Leonardo da Vinci works on an allegorical representation called 'Paradise', commissioned by Lodovico Sforza.

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1490

7 months, 4 days later

Leonardo da Vinci breaks off his studies on flight and does not resume them till 1505.

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1490

Leonardo da Vinci meets and adopts Giocomo Salai, a 10-year-old boy.

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1490

April 23

on Wednesday

3 months, 22 days later

Leonardo da Vinci begins work on a new codex and resumes work on The Horse.

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Astronomical Events

The moon was waxing crescent that night.

1490

June 15

on Sunday

1 month, 23 days later

Leonardo da Vinci goes to Pavia with Francesco di Giorgio Martini to advise on the construction of the cathedral.

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Astronomical Events

The moon was waning crescent that night.
Sunrise in Pavia was at 5:55 AM and sunset was at 6:02 PM.

1491

6 months, 20 days later

Leonardo da Vinci assists in the preparations for the tournament held in honour of Ludovico Sforza's marriage to Beatrice d'Este. For this he devised an invasion by a company of dancing and singing Scythians or Tartars, costumed as savages and led by a rider mounted on a big horse and wearing a cloak covered with golden scales and painted with peacock's eyes. ('Leonardo da Vinci', p. 61)

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1492

1 year later

At about this time in Milan, Leonardo was beginning to collect observations on painting and on a variety of scientific and literary subjects, with a view to gathering them in the form of treatises.

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1492

Leonardo da Vinci completes the clay model of The Horse.

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1492

January

Leonardo da Vinci directs the tournament of Galeazzo Sanseverino.

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1494

2 years, 1 day later

The 66 tons of bronze which has been set aside to cast Leonardo's equestrian statue is sent instead to Ferrara to make cannons for the war against France.

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1494

The clay cast for Leonardo's equestrian statue, known as Il Colosso, is displayed at the wedding of Bianca Maria Sforza to great acclaim.

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1494

September

8 months, 3 days later

Leonardo da Vinci drops plans for the Sforza monument until it can be cast and begins reclamation work in the Sforza lands near Vigevano, freeing one vast tract of water and converting another to a grazing area.

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1495

4 months, 2 days later

Leonardo da Vinci's mother Caterina is believed to die in Milan in this year.

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1495

Leonardo da Vinci begins work on The Last Supper in the refectory of the convent of Santa Maria delle Grazie in Milan.

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1497

June 29

on Tuesday

2 years, 6 months later

From a sheet of instructions that Lodovico Sforza gave to his secretary:

Item, to urge Leonardo the Florentine to finish the work that he has begun at the refectory of the Grazie, so that he may start with the other wall in the same refectory; and have him sign a contract obliging him to finish the work within the stipulated time.

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Astronomical Events

The moon was a new moon that night.

1498

February 9

on Wednesday

7 months, 15 days later

Leonardo da Vinci completes The Last Supper.

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Astronomical Events

The moon was waning gibbous that night.

1499

10 months, 26 days later

With the duke Ludovico Sforza's fall from power, Leonardo da Vinci flees Milan for Venice, with his assistant Giocomo Salai and friend, the mathematician Luca Pacioli.

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Agents

Ludovico Sforza (1452-1508), aged 47: duke
Luca Pacioli (1445-1517), aged 54: mathematician
Giocomo Salai (1480-1524), aged 19: painter

1500

1 year later

Giorgione meets Leonardo da Vinci in Venice.

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1500

Leonardo da Vinci and Luca Pacioli go to Mantua, then Leonardo continues on to Florence. In Mantua, he draws the Portrait of Isabella d'Este. In Florence, he paints the Virgin and Child with Saint Anne.

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1500

Leonardo da Vinci returns to Florence, where he and his household are guests of the Servite monks at the monastery of Santissima Annunziata and are provided with a workshop.

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1501

May 12

on Sunday

1 year, 4 months, 11 days later

Extract from a letter from Francesco Malatesta to Isabella d'Este mentioning Leonardo's viewing and valuation of some antique vases formerly owned by the Medici:

I showed them to Leonardo Vinci the painter. He praised all of them but especially the crystal one, because it is all of one piece and very clear.... and Leonardo said that he had never seen a better piece.

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Astronomical Events

The moon was waning crescent that night.

Source: Primary

Charles Nicholl; Nicholl, Charles. "Leonardo da Vinci. Flights of the Mind." E-book, p. 591.

1501

November 9

on Saturday

6 months, 1 day later

Leonardo da Vinci draws out 50 florins from his savings at Santa Maria Nuovo.

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Astronomical Events

The moon was a new moon that night.

Source: Primary

Charles Nicholl; Nicholl, Charles. "Leonardo da Vinci. Flights of the Mind." E-book, p. 591.

1502

1 month, 23 days later

An anecdote from Luca Pacioli's De viribus quantitatis relates an incident with Leonardo da Vinci in his capacity as military engineer on campaign with Cesare Borgia.

One day Cesare Valentino, Duke of Romagna and present Lord of Piombino, found himself and his army at a river which was 24 paces wide, and could find no bridge, nor any material to make one except for a stack of wood all cut to a length of 16 paces. And from this wood, using neither iron nor rope nor any other construction, his noble engineer made a bridge sufficiently strong for the army to pass over.

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Source: Primary

Charles Nicholl; Nicholl, Charles. "Leonardo da Vinci. Flights of the Mind." E-book, p. 602.

1502

In Cesena, Leonardo da Vinci begins work as senior military architect and general engineer for Cesare Borgia, son of Pope Alexander VI.

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1502

Leonardo da Vinci creates a map of Cesare Borgia's stronghold, a town plan of Imola in order to win his patronage.

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1502

Leonardo da Vinci gifts to his pupil Salai a precious garment given to him by Cesare Borgia.

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Agents

Cesare Borgia (1475-1507), aged 27: condottiero; cardinal; duke
Giocomo Salai (1480-1524), aged 22: painter

Source: Primary

Pedretti, Carlo. "Leonardo: A Study in Chronology and Style", p.142.

1502

July 30

on Wednesday

7 months later

Itinerary jotted down in Leonardo da Vinci's notebook:

30 July - "the dove-cote at Urbino".

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Astronomical Events

The moon was waning crescent that night.
Sunrise in Urbino was at 6:01 AM and sunset was at 6:08 PM.

1502

August 1

on Friday

2 days later

Itinerary jotted down in Leonardo da Vinci's notebook:

1 August -"In the library at Pesaro".

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Astronomical Events

The moon was waning crescent that night.
Sunrise in Pesaro and Urbino was at 6:01 AM and sunset was at 6:08 PM.

1502

August 8

on Friday

7 days later

Itinerary jotted down in Leonardo da Vinci's notebook:

8 August - "make harmonies out of the different falls of water as you saw in the fountain at Rimini on the 8th day of August".

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Astronomical Events

The moon was waxing crescent that night.
Sunrise in Rimini was at 6:01 AM and sunset was at 6:08 PM.

1502

August 10

on Sunday

2 days later

Itinerary jotted down in Leonardo da Vinci's notebook:

"At the Feast of San Lorenzo at Cesena."

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Astronomical Events

The moon was in the first quarter that night.
Sunrise in Cesena was at 6:01 AM and sunset was at 6:08 PM.

1502

August 15

on Friday

5 days later

Itinerary jotted down in Leonardo da Vinci's notebook:

15 August - "On St Mary's day in the middle of August at Cesena."

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Astronomical Events

The moon was waxing gibbous that night.
Sunrise in Cesena was at 6:00 AM and sunset was at 6:07 PM.

1502

August 18

on Monday

3 days later

Passport drawn up in Pavia granting Leonardo da Vinci free access to the dominions of Cesare Borgia as his chief military architect:

Cesare Borgia of France, by the grace of God Duke of Romagna and Valence, Prince of the Adriatic, Lord of Piombino etc., also Gonfalonier and Captain General of the Holy Roman Church: to all our lieutenants, castellans, captains, condottieri, officials, soldiers and subjects to whom this notice is presented. We order and command that the bearer thereof, our most excellent and well-beloved architect and general engineer Leonardo Vinci, who by our commission is to survey the places and fortresses of our states, should be provided with all such assistance as the occasion demands and his judgement deems fit.

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Astronomical Events

The moon was a full moon that night.
Sunrise in Pavia was at 5:59 AM and sunset was at 6:06 PM.

1503

4 months, 16 days later

Leonardo da Vinci begins painting the Mona Lisa and works on it on and off for the next thirteen years. Walter Pater gives an immortal description in a passage from The Renaissance.

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1503

Leonardo da Vinci returns to Florence where he is commissioned to paint a mural, The Battle of Anghiari, in the council hall in Florence's Palazzo Vecchio.

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1503

July 3

on Friday

6 months, 3 days later

Extract a cover letter from Leonardo da Vinci to Sultan Bejazet (or Beyazid) II offering his services. This is dated by Charles Nicholl to July 3, 1503.

I, your servant, have heard about your intention to build a bridge from Stanboul to Galata, and that you have not done it because no man can be found capable of it. I, your servant, know how. I would raise it to the height of a building, so that no one can pass over it because it is so high ... I will make it so that a ship can pass under it even with its sails hoisted.... I would have a drawbridge so that when one wants one can pass on to the Anatolian coast.... May God make you believe these words, and consider this servant of yours always at your service.

Attachments
Realisation of a bridge designed by Leonardo da Vinci

Astronomical Events

The moon was waxing gibbous that night.
Sunrise in Constantinople was at 5:59 AM and sunset was at 6:06 PM.

1503

October 18

on Sunday

3 months, 17 days later

Leonardo da Vinci rejoins the Guild of Saint Luke.

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Astronomical Events

The moon was waning crescent that night.

1503

October 24

on Saturday

6 days later

Leonardo da Vinci is assigned the Sala del Papa in S. Maria Novella to begin work on the cartoon for the Battle of Anghiari.

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Astronomical Events

The moon was waxing crescent that night.

Source: Primary

Pedretti, Carlo. "Leonardo: A Study in Chronology and Style," p. 82

1504

2 months, 9 days later

In Florence, Leonardo da Vinci and Niccolò Machiavelli become involved in a scheme to divert the Arno river, cutting the water supply to Pisa to force its surrender: Colombino, the project foreman, fails to follow da Vinci’s design, and the project is a major failure.

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Source: Primary

https://en.wikipedia.org/wiki/1504

1504

The Signoria of Florence commissions both Leonardo da Vinci and Michelangelo to paint the walls of the Grand Council Chamber in the Palazzo Vecchio.

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Source: Primary

https://en.wikipedia.org/wiki/1504

1504

May 4

on Wednesday

4 months, 4 days later

The mural for the Council Hall of Florence was commissioned from Leonardo with a contract of 4 May 1504, signed by Machiavelli as secretary of the Republic; but Leonardo had already begun working on the cartoon in the Sala del Papa in S. Maria Novella, which had been assigned to him on 24 October of the preceding year.

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Astronomical Events

The moon was waning gibbous that night.
Sunrise in Florence was at 5:52 AM and sunset was at 5:59 PM.

1504

Winter

Leonardo's work on the cartoon of the Battle of Anghiari was suddenly interrupted in the last months of 1504, and he went to Piombino on a somewhat official mission as a military architect. (During his absence Michelangelo was to receive the commission for the Battle of Cascina.) His mission was preceded by a diplomatic action conducted by Machiavelli himself. It can be inferred, therefore, that it was Machiavelli who suggested Leonardo's name for the programme of fortification projects suggested by Jacopo IV Appiano, Lord of Piombino, an ally of the Florentines at the time of the Pisian war, 1503-4, when Leonardo had already been consulted on the project of diverting the Arno River for strategic reasons, and when Antonio da Sangallo the Elder was the chief military architect of the Florentine Republic. Leonardo's activity at Piombino, revealed by newly discovered evidence, included the study of the city walls, the citadel and the main gate.

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1505

9 months, 5 days later

Leonardo da Vinci resumes his studies on flight, at Fiesole.

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1505

Michelangelo chances upon Leonardo da Vinci discussing Dante at Piazza della Signoria and berates him for his failure to cast The Horse.

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1505

Painting the Mona Lisa

Leonardo da Vinci had musicians play music to entertain Lisa when painting her portrait.

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1505

July 6

on Thursday

6 months, 6 days later

Leonardo da Vinci begins painting the Battle of Anghiari in the Palazzo Vecchio with the help of a few assistants.

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Astronomical Events

The moon was waxing crescent that night.

1506

5 months, 29 days later

Leonardo da Vinci returns to Milan.

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1506

Leonardo da Vinci took three months' leave of absence from his work on the Battle of Anghiari mural in Florence to go to Milan in the service of the French governor Charles d'Amboise, who commissioned the project of a house and garden from him.

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1507

1 year later

Leonardo da Vinci meets Francesco Melzi, a Milanese gentleman who becomes his pupil and one of his lifelong companions.

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1507

Leonardo da Vinci is back in Florence trying to sort out litigation issues with his brothers over his father's estate.

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1508

1 year later

Leonardo da Vinci is back in Milan, living in his own house in Porta Orientale.

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1513

4 years, 1 day later

The fragment of Leonardo's mural, the Battle of Anghiari, was protected with a wooden frame soon after the return of the Medici to Florence, when the rest of the room was dismantled and eliminated, as we everything referring to the preceding republican government.

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1513

Leonardo da Vinci moves to Rome at the invitation of the newly elected Pope Leo X, where he studies the properties of mirrors.

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Agents

Pope Leo X (1475-1521), aged 38: pope

1513

September 23

on Tuesday

8 months, 25 days later

A landslide occurred in the Alps near Bellinzona which is described by Leandro Alberti in 1550:

In the past years an earthquake caused a large part of a mountain to collapse, in such a way that the Bregno valley came to be obstructed; and as the river came to be dammed up, it produced a large and dark lake with great damage to the inhabitants of the valley, many of whom were drowned and their houses submerged. And so it stayed for quite some time, until the fallen earth made gradually soft by the infiltrations of the water and being no longer sufficiently strong to retain the immense pressure of it, suddenly burst open to the fury of the swollen waters. And since the former river bed, which was joined to the Ticino, was no longer adequate to contain it, the water flooded all the neighbouring regions, overthrowing in part even that strong wall which Lodovico Sforza had built near Bellinzona.

It is suggested by Carlo Pedretti that Leonardo da Vinci describes this event in the Codex Atlanticus around 1513:

... for in our own times a similar thing has been seen, that is, a mountain falling seven miles across a valley and closing it up and turning it into a lake.

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The moon was in the last quarter that night.
Sunrise in Bellinzona was at 5:49 AM and sunset was at 5:55 PM.
Sunrise in Ticino was at 5:49 AM and sunset was at 5:55 PM.
Sunrise in Bregno was at 5:49 AM and sunset was at 5:55 PM.

1513

September 25

on Thursday

2 days later

Leonardo da Vinci moves to Rome, together with his pupils Melzi, Salai and Il Fanfoia.

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The moon was waning crescent that night.
Sunrise in Rome was at 5:48 AM and sunset was at 5:54 PM.

Agents

Francesco Melzi (1491-1568), aged 22: painter
Giocomo Salai (1480-1524), aged 33: painter

Source: Primary

Pedretti, Carlo. "Leonardo: A Study in Chronology and Style", p. 140.

1513

October

6 days later

Leonardo da Vinci sketches an epigastric parasitic thoracopagus (a person with the body of a child growing out of their chest) that he saw in Florence, on his way to Rome.

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Source: Primary

Pedretti, Carlo. "Leonardo: A Study in Chronology and Style", p. 161.

1514

3 months, 2 days later

Leonardo da Vinci applied to join the confraternity of S. Giovanni dei Fiorentini in Rome, probably in a moment of depression at a court which had little or no consideration for him, in the hope that a religious institution could provide him with quiet shelter and affectionate assistance, and to which he could leave all his possessions, just as he was leaving drawings and other belongings to another religious institution in Florence, the hospital of S. Maria Novella, in which he was accommodated at the time he was working on the Battle of Anghiari.

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Source: Primary

Pedretti, Carlo. "Leonardo: A Study in Chronology and Style", p. 164.

1515

1 year later

Leonardo da Vinci constructs a mechanical lion for the coronation of the new king of France, Francois I.

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1515

December 19

on Sunday

11 months, 22 days later

Leonardo da Vinci is present at the meeting of King Francoise I and Pope Leo X, which takes place in Bologna.

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The moon was a full moon that night.
Sunrise in Bologna was at 5:53 AM and sunset was at 6:01 PM.

Agents

Pope Leo X (1475-1521), aged 40: pope
King Francoise I (1494-1547), aged 21: king

Source: Primary

http://en.wikipedia.org/wiki/Leonardo_da_Vinci

1516

13 days later

King Francoise I invites Leonardo da Vinci to come work for him.

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1516

Leonardo da Vinci finishes working on the Mona Lisa.

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1517

1 year, 1 day later

Leonardo da Vinci moves to France at the invitation of King Francoise I. He is granted the post of First Painter, Engineer and Architect of the King. Leonardo, and his pupils, Francesco Melzi and Giocomo Salai move into the chateau of Cloux near Amboise.

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Agents

King Francoise I (1494-1547), aged 23: king
Francesco Melzi (1491-1568), aged 26: painter
Giocomo Salai (1480-1524), aged 37: painter

1517

Leonardo da Vinci takes the Mona Lisa with him on his journey to his final residence at a chateaux in Amboise.

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1519

2 years later

Leonardo da Vinci wills the Mona Lisa to his lifelong assistant, Giocomo Salai.

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1519

May 3

on Saturday

4 months, 2 days later

Leonardo da Vinci dies at Château du Clos Lucé. He is originally buried in the Church of St Valentine at Amboise.

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The moon was waxing crescent that night.
Sunrise in Château du Clos Lucé was at 5:53 AM and sunset was at 5:59 PM.

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