Ezio as he appears in AC:R

Ezio Auditore da Firenze was a late 15th and early 16th century Master Assassin. He belonged to the Italian Branch of the Order of Assassins, of which he was the Mentor since 1503. He and his actions influenced and angered the Templar Order, as he wiped out the entire Borgia Family in power of Rome, a family allied to the Templars. He then traveled to Constantinople to collect the keys to Master Assassin Altaïr Ibn-La' Ahad's Library, which the Templars beleived contained the Grand Temple.

Ezio assassinated the majority of the Templar Agents, and sent his Assassin Apprentices to kill the others.