Leonardo’s birth was recorded by his paternal grandfather, Antonio da Vinci, on the last page of his family memories book.
“A grandson was born to me, son of my son Ser Piero, on the 15th day of April, a Saturday, at 3 in the morning. He has the name Lionardo. He was baptized by the priest Piero di Bartolomeo da Vinci, in the presence of Papino di Nanni, Meo di Tonino, Piero di Malvolto, Nanni di Venzo, Arigo di Giovanni Tedesco, Monna (Lady) Lisa di Domenico di Brettone, Monna Antonia di Giuliano, Monna Niccolosa del Barna, Monna Maria, daughter of Nanni di Venzo, and Monna Pippa di Previcone.”
Florence state archives, Notarile antecosimiano (Pre-Cosimo records), 16912, c. 105v.