In Assassin's Creed II, which Renaissance inventor gives Ezio a flying machine?

In Assassin's Creed II, Leonardo da Vinci gives Ezio a flying machine.

Leonardo is one of Ezio's most important allies in the historical storyline. He deciphers pages from Altaïr's Codex, develops equipment for Ezio, and helps adapt a flying machine for use during a mission in Venice. The machine is inspired by Leonardo's real studies of flight, although the game's successful powered flight is a fictional adventure sequence.

The relationship draws on Leonardo's documented work as an artist, engineer, and inventor while placing him inside the series' fictional Assassin-Templar conflict. He is not Ezio's mentor; figures such as Mario Auditore and Niccolò Machiavelli fill important guidance roles at different points. Leonardo's workshop also serves a practical gameplay purpose, since Codex pages and other upgrades can be converted into new tools for Ezio.