Realistic copy of J. Caesar's RSC 69, probably struck by the order of Aulus Hirtius by a Gallic Engraver (Traité, p. 152, 664-665), BN 9233-9244

Aulus Hirtius, friend of Caesar and author of book 8 of The Gallic Wars, mentions the Treviri several times, firstly:

[8.25]After he had sent either his legions or auxiliaries through every part of Ambiorix's dominions, and wasted the whole country by sword, fire, and rapine, and had killed or taken prodigious numbers, he sent Labienus with two legions against the Treviri, whose state, from its vicinity to Germany, being engaged in constant war, differed but little from the Germans, in civilization and savage barbarity; and never continued in its allegiance, except when awed by the presence of his army.