Da Vinci's mom was a slave?

April 9, 2008 -- Leonardo Da Vinci, regarded by many as the greatest genius of the Renaissance, was the son of a humble slave girl and had at least 21 half-siblings, according to compelling new evidence unveiled in Florence, Italy, on Wednesday.

Newly discovered documents published in two books ("Was Leonardo's Mother a Slave?" and "Leonardo's Family Tree," both edited by da Vinci scholars Agnese Sabato and Alessandro Vezzosi) have made it possible to reconstruct da Vinci's little-known family tree.

"Da Vinci's family was indeed a large one. His father Piero married not his mother, but four other women. His mother Caterina was married off to another man and had five children of her own. That's what you would call an enlarged family," Alessandro Vezzosi, director of the Museo Ideale in the Tuscan town of Vinci, told Discovery News.