Federico Auditore da Firenze

Federico Auditore da Firenze is the brother of Ezio. He is portrayed by Jesse Rath in both Assassin's Creed II and Assassin's Creed: Lineage.

Assassin's Creed: Lineage
Federico Auditore is a florentine young nobleman living during the 15th century in Italy: the Renaissance. He is the one of the sons of Giovanni Auditore, an Assassin, a "profession" of his father that he doesn't know.

Assassin's Creed II
Federico is executed along with his father and his brother Petruccio at the beginning of the game, victim of a conspiracy.