Which historical figure provides inventions and equipment to Ezio in Assassin's Creed II?

Leonardo da Vinci provides inventions and equipment to Ezio in Assassin's Creed II.

In the game, Leonardo is portrayed as an inventive Florentine artist and engineer who becomes one of Ezio's closest allies. He deciphers pages from Altaïr's Codex and turns their designs into practical tools, including upgraded hidden blades and a pistol mechanism.

Leonardo also helps Ezio use a flying machine during a mission in Venice. This sequence is fictionalized, but it draws on Leonardo's real studies of flight and his surviving sketches of ornithopters and other mechanisms.

The historical Leonardo lived from 1452 to 1519 and worked in several Italian courts, including Milan and Florence. Assassin's Creed II blends his documented reputation as an artist and engineer with invented relationships and adventures, so the game's version should not be treated as a biography.