Mario Auditore (1434 – 1500) was the leader of the Italian Brotherhood of Assassins from at least 1476 to his death, a condottiero, and the ruler of Monteriggioni from 1454 until his death. During his life, Mario worked with his brother, Giovanni, also an Assassin, to gather the lost pages of Altaïr Ibn-La'Ahad's Codex, as well as fortifying and defending Monterrigioni to prevent invasions. Under his rule, Monteriggioni became a flourishing community again.