Cunctis qui aderant annitentibus, sed praecipue Croco (alii Eroco) [Erich?] Alemannorum Rege, auxilii gratia Constantium comitato, imperium capit. Victor Junior, c. 41.
This is perhaps the first instance of a barbarian king who assisted the Roman arms with an independent body of his own subjects. The practice grew familiar, and at last became fatal.