Was Ezio auditore de Firenze Leonardo da vincis best friend?

Answer 1

in my opinion, i think he is because Leonardo has helped ezio for many time and ezio knew Leonardo when he was very young. also, ezio told Leonardo classified secrets like the prophet and the pieces of eden his uncle told him.

Answer 2

Yes - Ezio often referred to Leonardo as "my oldest friend" during his time in Roma (1499 - 1507).