In Assassin's Creed Unity, Paris is the primary setting of Arno Dorian's story.
Unity takes place during the French Revolution, beginning in 1789 and continuing through the revolutionary upheaval. Arno Dorian moves through Paris while investigating his adoptive father's murder and becoming involved with the Assassin Brotherhood.
The game recreates recognizable Parisian locations, including the Notre-Dame Cathedral, the Tuileries, and the Palace of Versailles. Its dense crowds and interconnected streets support both stealth missions and cooperative multiplayer activities.
London is the main setting of Syndicate, while Madrid and Vienna are associated with other historical fiction rather than Unity's principal map. Paris is therefore the specific city tied to Arno's campaign.