In Assassin's Creed Unity, Paris is the principal setting during the French Revolution.
The game follows Arno Dorian, an Assassin active in Paris from the late 1770s through the revolutionary period. Its recreation includes districts, streets, monuments, and political locations associated with the city. Paris acts as the main open world for missions, investigations, parkour, and cooperative activities.
The French Revolution began in 1789 and transformed France's political system. Unity incorporates events and figures from that era, but Arno's personal story and the Assassin-Templar plot are fictional. The game's urban design emphasizes dense crowds and climbable architecture, matching Paris's role as a revolutionary capital.
Versailles appears early in the game and is historically significant, but it is not the principal setting. Lyon and Marseille are French cities, yet the game's main revolutionary environment is Paris.