" Leonardo’s twenty-six-year-old father, Ser Piero, was (as his honorary title implied) a notary: someone who wrote wills, contracts, and other commercial and legal correspondence. The family had produced notaries for at least five generations, but with Leonardo the chain was to snap. He was, as his grandfather’s tax return stated a few years later, “non legittimo”—born out of wedlock—and as such he (along with criminals and priests) was barred from membership in the Guild of Judges and Notaries. Leonardo’s mother was a sixteen-year-old girl named Caterina, and an apparent difference in their social status meant she and Piero, a bright and ambitious young man, did not marry. Almost "

― Ross King , Leonardo and the Last Supper