The Gallic Lutetia
  Localisations éventuelles de l'oppidum
Possible locations of the oppidum
  The only mention of Gallic Lutetia is found in Caesar's Gallic Wars, where Caesar tells us that Lutetia was an oppidum of the Parisii people, and that-like the oppidum of the Senons tribe-it was built on an island in the Seine. Based on this literary source, historians have tended to associate the oppidum of the Parisii with the Île de la Cité, making Paris' largest island the city's birthplace.

An oppidum on the Île de la Cité ?
This theory is supported by several facts. First, the island-as it appeared in Antiquity-is the largest in the Paris area.
  Second, in 1711, sections of the Boatmen's Pillar were discovered beneath Notre-Dame cathedral. Even though the pillar was a testament to the Romanisation of Lutetia, it bore representations of divinities from the Gallic pantheon. In addition, the main Roman road that crossed the island from north to south proves that the island was already to both banks by bridges that probably replaced the ones mentioned by Caesar. One final argument is that Caesar compared the island with the Île de Melun, whose present topography is very similar to the Île de la Cité.

An uncertain identification
This identification assumes that the configuration of the islands and the course of the Seine since protohistoric times remained relatively unchanged-a claim that is invalidated by recent excavations along the banks. It now appears that the island was given its current shape by the quays built by the Romans. Prior to this, we must imagine a group of islets surrounding a main island whose surface area did not exceed 9 hectares. Finally, multiple excavations on the island have not revealed any layer dateable to the Gallic period-no fortifications, no burn layers, and no trace of urban development.