In Assassin's Creed Unity, the major city recreated during the French Revolution is Paris.
The game is set in Paris beginning in 1789, the year the French Revolution started. Players control Arno Dorian as he moves through crowded streets, political unrest, revolutionary violence, and the secret conflict between the Assassins and Templars.
Unity emphasizes a detailed version of Paris, including landmarks such as Notre-Dame de Paris, the Louvre, and the Bastille. The city is divided into districts and supports both the main campaign and cooperative missions.
Versailles also appears in the game and is important to Arno's early life, which can cause confusion. However, Versailles is a separate royal city west of Paris; Paris is the principal setting and the location named by the question.