C. Julius Caesar, Gallic War

There was among the Carnutes a man named Tasgetius, born of very high rank, whose ancestors had held the sovereignty in his state. To him Caesar had restored the position of his ancestors, in consideration of his prowess and attachment toward him, because in all his wars he had availed himself of his valuable services. His personal enemies had killed him when in the third year of his reign, many even of his own state being openly promoters [of that act] This event is related to Caesar. He fearing, because several were involved in the act, that the state might revolt at their instigation, orders Lucius Plancus, with a legion, to proceed quickly from Belgium to the Carnutes, and winter there, and arrest and send to him the persons by whose instrumentality he should discover that Tasgetius was slain. In the mean time, he was apprised by all the lieutenants and questors to whom he had assigned the legions, that they had arrived in winter-quarters, and that the place for the quarters was fortified.