Digenes Akritas

Digenes Akritas was a book obtained by Ezio Auditore da Firenze in the 16th century from Cappadocia's book shop.

Summary
''Set amid the backdrop of a centuries' old conflict between Byzantines and Arabs, the "Digenes Akritas" (author unknown) tells the epic tale of Basil, a hero born of mixed parentage - one Byzantine, the other Syrian - and his incredible feats of strength and bravery. A warrior through and through, Basil kills bears and lions with his hands, slays dragons with little more than a look, and carries off the daughters of military commanders on a whim. In other words, a well rounded chap.''

Reference

 * Assassin's Creed: Revelations