a brother of Arminius, chief of the Cheruscans.
In the summer of A. D. 16, the Romans and the Cheruscans were drawn up on the opposite banks of the Weser (Visurgis), when Arminius, prince of the Cheruscans, stepped forth from a group of chieftains, and demanded to speak with his brother, a distinguished officer in the Roman army. Flavius had lost an eye in the service of Rome.
The brothers, after their followers had fallen back, conversed across the stream. On learning the cause of his brother's disfigurement, Arminius asked what had been its compensation. Flavius replied, increased pay, and the usual rewards of valour. Arminius derided his chains and chaplet, as the gear of a slave; and now began between therm an angry colloquy, which, but for the stream between, would have passed into blows. (Tac. Ann. 2.9
A descendant of Flavius, named Italicus, became in A. D. 47 chieftain of the Cheruscans. (Ibid.