Date of Birth: 1473.
A veteran soldier under the Borgia, Donato also served in the city guard. The chroniclers at court describe him as a cold, loyal enforcer and an expert rider.
I'm not able to get in very far, but the Abstergo servers contain a small piece of data about him: "One of Cesare's top horsemen, Donato Mancini's skill is only surpassed by his ego."
That Cesare sure knows how to pick 'em.