The Treveri tribe of Gaul inhabited the lower valley of the Moselle, within the southern fringes of the vast Arduenna Silva (Ardennes Forest). They were bordered on the north, west and south by the Belgic tribes the Tungri, the Remi and the Mediomatrici, respectively, who were friendly to Rome, while to the east were the Germanic Vangiones. Their tribal capital Colonia Augusta Treverorum (Trier, Germany) was also the site of a Roman colony, and the provincial capital of Belgica itself.
The Treveri provided Julius Caesar with his best cavalry. After Caesar's successful campaigns in Gaul, the Treveri were forcefully integrated into the Roman Empire, thereby losing not only their political independence but their cultural identity as well. Following the failure of the uprising of 54/53 B.C. the leading families of the Treveri are reported to have crossed the Rhine, to settle among the Germanic tribes.
Tutor, having augmented the army of the Treveri with fresh levies from the Vangiones, the Caeracates, and the Triboci, strengthened it with a force of veteran infantry and cavalry, men from the legions whom he had either corrupted by promises or overborne by intimidation.
The Treveri were panicstricken by this disaster, and the common people threw down their arms, and dispersed themselves through the country.
The territory of the Treveri was occupied by the victorious army, when Civilis and Classicus sent letters to Cerialis, the purport of which was as follows: "Vespasian, though the news is suppressed, is dead.