On Wednesday at seven o’clock died Ser Piero da Vinci on the 9th of July 1504.
[Footnote: This and the previous text it may be remarked are the only mention made by Leonardo of his father; Nos. 1526, 1527 and No. 1463 are of the year 1504.]
Taken from The Notebooks of Leonardo da Vinci edited by Jean Paul Richter, 1880.