In pre-Roman Gaul the Belgic tribe of the Veliocasses or Velocasses controlled a large area in the lower Seine valley, which retains a trace of their name, as the Vexin, in 52 they raised 3000 men to support which son of Celtillus the Avernian, leader of the Gallic tribes?
Vercingetorix Vercingetorix was the son of Celtillus the Avernian, leader of the Gallic tribes. Vercingetorix came to power after his formal designation as chieftain of the Arverni at the oppidum Gergovia in 52 BC. He immediately established an alliance with other Gallic tribes, took command and combined all forces, and led them in the Celts' most significant revolt against Roman power. He won the Battle of Gergovia against Julius Caesar in which several thousands Romans and allies died and Caesar's Roman legions withdrew.
Ambicatus Ambicatus (or Ambigatos in Gaulish) is mentioned in the founding legend of Mediolanum (Milan) by Livy, whose source is Timagenes, as a king of the Bituriges, "kings of the world" as their name suggests, who ruled over the Celts in central Gaul, between Hispania and Germany, in the days of Tarquinius Priscus (the sixth century BCE). Ambicatus sent his sister's sons, Bellovesus and Segovesus, with many followers drawn from numerous tribes, to found new colonies in the Hercynian forest and in northern Italy, in the early sixth century BC. Bellovesus founded Mediolanum. If Ambicatus was an authentic historical figure, rather than a construct to express the linked origins of Celtic tribes in northern Italy and beyond the Alps, most likely he was the leader of the most powerful tribe in a military alliance, from which the Celtic colonizers of Italy were apparently drawn.