Marcantonio Colonna at Santi Apostoli.
[Footnote: In July 1506 Pope Julius II gave Donna Lucrezia della Rovere, the daughter of his sister Lucchina, in marriage to the youthful Marcantonio Colonna, who, like his brothers Prospero and Fabrizio, became one of the most famous Captains of his family. He gave to him Frascati and made him a present of the palazzo he had built, when Cardinal, near the church of Santi Apostoli which is now known as the Palazzo Colonna (see GREGOROVIUS, Gesch. der Stadt Rom. Vol. VIII, book XIV I, 3. And COPPI, Mem. Colonnesi p. 251).]
Taken from The Notebooks of Leonardo da Vinci edited by Jean Paul Richter, 1880.