MAIN CHARACTERS Cesare Borgia (c. 1475-1507). Italian warrior, illegitimate son of Pope Alexander VI, subject of Machiavelli's The Prince, Leonardo employer. Donato Bramante (1444-1514). Architect, friend of Leonardo in Milan, worked on Milan Cathedral, Pavia Cathedral, and St. Peter's in the Vatican. Caterina Lippi (c. 1436-1493). Orphaned peasant girl from near Vinci, mother of Leonardo; later married Antonio di Piero del Vaccha, known as Accattabriga. Charles d'Amboise (1473-1511). French governor of Milan from 1503 to 1511, Leonardo patron.