Leonardo was born on April 15, 1452, "at the third hour of the night"[nb 5] in the Tuscan hill town of Vinci, in the lower valley of the Arno River in the territory of Florence. He was the illegitimate son of Messer Piero Fruosino di Antonio da Vinci, a Florentine notary, and Caterina, a peasant who may have been a slave from the Middle East. Leonardo had no surname in the modern sense, "da Vinci" simply meaning "of Vi...