Catherine (Caterina) da Vinci

The father of Leonardo da Vinci, Ser Piero, was a 25 year old public notary when Leonardo was born. Later that year, Ser Piero married his first wife. He didn't marry the mother of Leonardo, probably because she was a daughter of a farmer. The mother of Leonardo was called Catarina. According to Freud, the mysterious smile on da Vinchi's Mona Lisa actually originated in Caterina's repetitive smile during Leonardo's early childhood.