The 1st arrondissement of Paris is one of the 20 arrondissements (administrative districts) of the capital city of France. Situated principally on the right bank of the River Seine, it also includes the west end of the Île de la Cité. The arrondissement is one of the oldest in Paris, the Île de la Cité having been the heart of the city of Lutetia, conquered by the Romans in 52 BC, while some parts on the right bank date back to the early Middle Ages.