His robust physical qualities were hereditary for many generations in his family.

His son Francesco was tall and well made, the best runner, jumper, and wrestler of his day.

He marched, summer and winter, bareheaded; needed but little sleep; was spare in diet, and self-indulgent only in the matter of women.

Galeazzo Maria, though stained by despicable vices was a powerful prince, who ruled his duchy with a strong arm.
Of his illegitimate daughter, Caterina, the wife of Girolamo Riario, a story is told, which illustrates the strong coarse vein that still distinguished this brood of princes.

[See Dennistoun, 'Dukes of Urbino,' vol.i.p.