Wikipedia
Namnetes
They were neighbours to the Veneti people (north-west), the Redones (North), the Andecavi (east) and the Pictones (south).
In the spring 56 BC during the Gallic wars and according to Caesar, the Namnetes allied to the Veneti to fight against the fleet made by Caesar. Decimus Brutus, leader of the Roman fleet, finally won the battle.
During Roman domination, the Namnete capital city was located at the confluence of the Loire and the Erdre; its name was probably Condevicnum. During the 3rd century AD, the city became known as Portus Namnetum, then Nantes in the Middle Ages.