The Ubii were a Germanic tribe first encountered dwelling on the right bank of the Rhine in the time of Julius Caesar, who formed an alliance with them in 55 BC in order to launch attacks across the river. They were transported in 39 BC by Marcus Vipsanius Agrippa to the left bank. This was apparently at their own request, as they feared the incursions of the Suebi. Agrippa founded the city of Cologne as their capital, whose Latin name Colonia Agrippensis is the origin of the current form. The Ubii remained loyal allies of Rome, and were instrumental in crushing the Batavian revolt in 70. They seem to have been so thoroughly Romanised that they adopted the name Agrippenses in honour of their “founder”, and their later history is submerged in that of eastern Gaul as a whole.