What is the name of the Assassin's Creed game released in 2009 that introduced Ezio Auditore?

The Assassin's Creed game released in 2009 that introduced Ezio Auditore is Assassin's Creed II. It follows Ezio from his youth in Renaissance Italy as he becomes involved in the Assassin-Templar conflict.

The game expanded substantially on the 2007 original by adding economic systems, equipment upgrades, swimming, a larger range of weapons, and several Italian cities. Ezio's story begins in Florence and later includes locations such as Venice and the Tuscan countryside. Leonardo da Vinci provides inventions and technical help during the campaign.

Assassin's Creed Brotherhood, released in 2010, continues Ezio's story in Rome, while Revelations, released in 2011, brings him to Constantinople and links his life to Altaïr's legacy. Those follow-ups are often confused with the game that first introduced him. Ezio became one of the franchise's most prominent protagonists and returns in short films, remastered collections, and other series material.