In what year is Assassin's Creed Mirage primarily set?

Assassin's Creed Mirage is primarily set in 861 CE.

The game follows Basim Ibn Ishaq in ninth-century Baghdad, during the Islamic Golden Age under the Abbasid Caliphate. It depicts Basim's development from a street thief into a Hidden One and focuses on investigation, stealth, contracts, and movement through a dense historical city.

Baghdad was founded in 762 CE by the Abbasid caliph Al-Mansur and became a major center of scholarship, trade, administration, and culture. Mirage uses that historical environment as the setting for Basim's personal story and his contact with the Hidden Ones.

The date can be confused with other Assassin's Creed eras. The original game is set around 1191 during the Third Crusade, Assassin's Creed II begins in 1476, and Syndicate takes place in 1868. Mirage deliberately returns to an earlier period in the franchise's chronology.