Nemetocenna is the name Caesar gives to his winter quarters in 51/50 BCE and Nemetacum is the name of the Roman town of Arras. There are two proposals to explain these names.

The first sees Nemetocenna as the name for the site at Etrun at the junction of the Scarpe and the Gy. Here is the largest hill fort in France, undoubtedly an oppidum, if not the oppidum, of the Atrebates. There are two "fana" at the foot of the fort at Duisans. These religious sites could be the source of the name Nemetocenna (sacred place). But, for the moment, the fort at Etrun remains unexcavated and no traces of La Tene III or first century BCE Roman military gear have been found.