VELOCASSES as Caesar ( B. G. 2.4) writes the name, Vellocasses in Pliny (Plin. Nat. 4.18), and in Ptolemy Οὐενελιοκάσιοι (2.8.8). Caesar places them in the country of the Belgae, and consequently north of the Seine. The number of fighting men that they could muster in B.C. 57 was estimated at 10,000, unless Caesar means that they and the Veromandui together had this number. In the division of Gallia by Augustus, the Velocasses were included in Lugdunensis. Their chief town was Rotomagus ( Rouen) on the north bank of the Seine. West of the Velocasses were the Caleti, whose country extended along the coast north of the Seine. That part of the country of the Velocasses which is between the rivers Andelleand Oise, became in modern times Vexin Normandand Vexin Français, the little river Epteforming the boundary between the two Vexins.
[G.L]