In Assassin's Creed II, which inventor helps Ezio Auditore develop his flying machine?

In Assassin's Creed II, Leonardo da Vinci helps Ezio Auditore develop his flying machine. Leonardo translates pages from Altaïr's Codex and uses their designs to create technological equipment for Ezio.

The flying machine is based on Leonardo's interest in flight and is used during a mission in Venice. Ezio pilots it over the city's rooftops, using burning structures to generate the lift needed for the machine to stay airborne.

Leonardo's role is broader than this single invention. He also improves Ezio's hidden blade, creates a poison blade, and builds other devices after moving between Florence and Venice.

The historical Leonardo was a painter, engineer, anatomist, and inventor active during the Italian Renaissance. The game blends documented interests and inventions with fictional Assassin lore, so the playable machine is part of the series' alternate-history storytelling.