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
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 coinage was changed: that is, silver coins began to be used; and it was decided that the grossone should be worth 16 quattrini and a half, like the old silver ones. All the taxes were to be paid in silver, which meant a little increase to the people, as a quarter more had to be paid, when there was need, on the contrary, to relieve them. This increase was made by divine permission, on account of our sins; because the poor are generally worse than the rich and great. Praise be to God!
This same day they began a causeway between the Loggia de' Signori and the Palagio, so high that one could walk on a level from the door of the Palagio into the Loggia; with steps leading towards San Piero Scheraggio(1) and towards the Piazza, so that neither horses nor any other animals could pass there any longer. It was also rather inconvenient for people, having to go up and down again. Some persons liked this causeway, and others not; I myself did not care for it much.
(1) This church was one of the oldest in Florence; it was in the form of a basilica, its interior somewhat resembling San Miniato al Monte. Many political meetings were held in it. The Florentines hung the "Caroccio" of Fiesole on the marble facade (afterwards copied in marble, but destroyed with the rest of the church)l and tradition says that the ancient marble pulpit or ambone was also from Fiesole. This pulpit, when the church was suppressed, was given to the little church of San Leonardo in Arcetri, which was connected with San Piero Scheraggio, and it can still be seen there. The north wing of San Piero was demolished first, to widen the street between it and the Palazzo Vecchio (this street is named after the Capella delle Ninne), and the south wing was also closed, the central aisle being still used for service till the year 1560 when the church, chapter-house and loggia were all demolished to make place for the Uffizi. (Trans.)