Gian Galeazo Sforza

Milanese duke born in Abbiategrasso (1469) and died in Pavia (1494), aged 25


Galeazzo Maria Sforza Milanese duke


Bianca Maria Sforza (1472-1510) Italian woman


Galeazzo Maria Sforza is assassinated, leaving his throne to his seven-year old son, Gian Galeazo Sforza.

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Gian Galeazo Sforza (1469-1494), aged 7: duke


July 10

on Wednesday

2 years, 6 months, 11 days later

Another ambassador came from the King of France; he was going to the Pope, and was lodged in the house of Giovanni Tornabuoni.

And at this time the horsemen of the Duke of Milan came by the Pisan road, and passed near Poggibonizi, and the troops of the king continued to approach.

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Astronomical Events

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


Pope Sixtus IV (1414-1484), aged 64: pope
Gian Galeazo Sforza (1469-1494), aged 9: duke

Source: Primary

Luca Landucci; "A Florentine Diary"; p. 21


2 years, 5 months, 26 days later

After a bitter struggle for the duchy of Milan with the child-regent Gian Galeazzo Sforza's mother, Bona of Savoy, followed, the boy's uncle, Ludovico Sforza, emerges as victor and seizes control of the government of Milan.

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Ludovico Sforza (1452-1508), aged 29: duke
Gian Galeazo Sforza (1469-1494), aged 12: duke



7 years, 5 months, 3 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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January 15

on Tuesday

7 months, 18 days later

The daughter(1) of the Duke of Calabria passed through Florence, on her way to wed the Duke of Milan,(2) with a large escort of horsemen, and many Signori and matrons and damsels in her train; a very great and noble company. A magnificent escort was sent to meet her, at incalculable cost.

(1) Isabella d'Aragona. (2) Giangalleazzo Sforza.

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Astronomical Events

The moon was a full moon that night.


4 years, 11 months, 22 days later

Gian Galeazo Sforza dies under suspicious conditions, in Milan, and the throne falls to his uncle, Ludovico Sforza.

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Gian Galeazo Sforza (1469-1494), aged 25: duke
Ludovico Sforza (1452-1508), aged 42: duke





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