The original Assassin's Creed is mainly set during which historical conflict?

The original Assassin's Creed is mainly set during the Third Crusade.

Its historical sections take place in 1191, during the conflict between forces associated with the Crusader states and the Muslim-led territories of the region. The game presents cities including Jerusalem, Acre, and Damascus as major locations.

Altaïr Ibn-La'Ahad is the central Assassin character. His missions involve political and military figures connected to the conflict, while the game adds fictional secret-society elements to its historical backdrop.

The Third Crusade is generally dated from 1189 to 1192 and followed the capture of Jerusalem by Saladin in 1187. The game does not attempt to reproduce every historical event literally; instead, it uses the period as the setting for its fictional Assassin-Templar narrative.