Baghdad is the main setting for Basim's early Assassin story in Assassin's Creed Mirage.
Mirage is set in ninth-century Baghdad during the Islamic Golden Age. It follows Basim Ibn Ishaq before the events of Assassin's Creed Valhalla, showing his transition from a street thief into a member of the Hidden Ones, the organization that later becomes known as the Assassin Brotherhood.
The city is divided into districts with distinct historical and social identities, including the Round City, Abbasiyah, Harbiyah, and Karkh. Basim investigates a conspiracy involving the Order of the Ancients while working with Hidden Ones such as Roshan and Fuladh.
Baghdad was the capital of the Abbasid Caliphate and a major center of scholarship, administration, and culture. Mirage's setting is therefore different from the Levantine cities featured in the first Assassin's Creed, even though the two games share historical themes and the Hidden Ones' legacy.