Which Assassin's Creed game introduced the Brotherhood's recruits system and the city of Rome as its main setting?

Assassin's Creed: Brotherhood introduced the Brotherhood's recruits system and uses Rome as its main setting. The 2010 game continues Ezio Auditore's story after Assassin's Creed II and focuses on rebuilding the Assassin Brotherhood in Renaissance Italy. Ezio can recruit civilians, train them, and call them into missions.

Rome is presented as a large open-world city under the influence of the Borgia family and the Templar Order. The player liberates districts, restores shops and landmarks, and develops the city while weakening Borgia control. This city-building structure is one of the game's defining systems.

Assassin's Creed II includes Ezio's earlier Italian journey, while Revelations later moves him to Constantinople and concludes his major storyline. Brotherhood also introduced multiplayer to the series, giving players roles such as the Doctor, Courtesan, and Executioner. Its title refers both to the organization Ezio rebuilds and to the game's emphasis on coordinated Assassin support.