Aldo was a thief of the Roman Guild under the leadership of La Volpe. He had one brother, who was also a member of the guild. According to his brother, Aldo was a mere pickpocket, who "never harmed anyone."
Sometime in the early 16th century, Aldo was captured by the rival Cento Occhi thieves, who planned to execute him. His brother met with Ezio Auditore, Mentor of the Assassin Order allied with his guild, and requested he rescue Aldo.