Niccolò Machiavelli

Niccolò di Bernardo dei Machiavelli (3 May 1469 – 21 June 1527) was an Italian philosopher, writer, and is considered one of the main founders of modern political science. He was a diplomat, political philosopher, musician, and playwright, but foremost he was a civil servant of the Florentine Republic.

Description
Niccolò was in secret a member of the Assassin Order. This was perhaps why he was such a secretive person, to not reveal too much about himself. He may also have been the Grand Master of the Assassins, due to his black robe and him speaking for the other Assassins.

Niccolò and the other Assassins were to attack Rodrigo Borgia, who was at that point in possession of the Apple of Eden. Unbeknownst to them, Ezio Auditore da Firenze also knew about Rodrigo having the Apple and had already attacked him. The other Assassins went to help him fend off Rodrigo's guards. Eventually, Rodrigo ran away, leaving the Apple behind. Niccolò revealed himself along with the other Assassins, who had helped Ezio assassinate the Templars before.

Niccolò was present at Ezio's initation into the Assassin Brotherhood, performing a Leap of Faith along with the other Assassins.

Eventually, Niccolò helped Ezio defend Caterina Sforza and the city of Forlì. He also aided him during the Bonfire of the Vanities, in which Girolamo Savonarola acquired the Apple of Eden.

Trivia

 * It is possible that the game's developers chose Machiavelli because of his supposed character during the Renaissance, as he is thought to have been a very secretive person.