In Assassin's Creed II, which Renaissance artist helps Ezio by building and upgrading his equipment?

In Assassin's Creed II, Leonardo da Vinci helps Ezio by building and upgrading his equipment.

Leonardo is introduced as a close friend and practical ally of the Auditore family. He deciphers pages from Altaïr's Codex and turns their designs into useful tools for Ezio, including improvements to the hidden blade. His workshop also provides the mechanism for several equipment upgrades during the story.

The game portrays Leonardo as a gifted inventor and artist, but the relationship is fictionalized for the adventure. Leonardo historically worked in Florence and later in Milan, and he was born in 1452. Assassin's Creed II uses his documented interests in engineering, anatomy, and flight as inspiration for its inventions.

The flying machine associated with Leonardo is a memorable example of this blend of history and fiction. It is used in a game mission, while the broader claim that Leonardo personally equipped a Renaissance Assassin belongs to the fictional narrative.