Lutetia, also known as Lutecia and Lutetia Parisiorum, was a Gallo–Roman town and the predecessor of modern-day Paris. Traces of an earlier Neolithic settlement have been found nearby, and a larger settlement was established around the middle of the third century BC by the Parisii, a Gallic tribe. The site was an important crossing point of the Seine, the intersection of land and water trade routes.

The Parisii were a Gallic tribe that dwelt on the banks of the river Seine during the Iron Age and the Roman era. They lived on lands now occupied by the modern city of Paris, whose name is derived from the ethnonym.