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Early life

Masaccio was born to Giovanni di Simone Cassai and Jacopa di Martinozzo in Castel San Giovanni di Altura, now San Giovanni Valdarno (today part of the province of Arezzo, Tuscany). His father was a notary and his mother the daughter of an innkeeper of Barberino di Mugello, a town a few miles north of Florence. His family name, Cassai, comes from the trade of his paternal grandfather Simone and granduncle Lorenzo, who were carpenters/cabinet makers (casse, hence cassai). Masaccio's father died in 1406, when he was only five; later that same year a brother was born, named Giovanni (1406–1486) after his father. He also was to become a painter, with the nickname of Lo Scheggia meaning "the splinter." In 1412 Monna Jacopa married an elderly apothecary, Tedesco di maestro Feo, who already had several daughters, one of whom grew up to marry the only other documented painter from Castel San Giovanni, Mariotto di Cristofano (1393–1457).

There is no evidence for Masaccio's artistic education; however, Renaissance painters traditionally began an apprenticeship with an established master around the age of 12. Masaccio would likely have had to move to Florence to receive his training, but he was not documented in the city until he joined the painters guild (the Arte de' Medici e Speziali) as an independent master on January 7, 1422, signing as "Masus S. Johannis Simonis pictor populi S. Nicholae de Florentia."