20When the barbarians heard of Gaius’ expedition, Phrataces sent men to Augustus to explain what had occurred and to demand the return of his brothers on condition of his accepting peace. The emperor sent him a letter in reply, addressed simply to “Phrataces,” without the appellation of “king,” in which he directed him to lay aside the royal name and to withdraw from Armenia. Thereupon the Parthian, so far from being cowed, wrote back in a generally haughty tone, styling himself “King of Kings” and addressing Augustus simply as “Caesar.” Tigranes did not at once send any envoys, but when Artabazus somewhat later fell ill and died, he sent gifts to Augustus, in view of the fact that his rival had been removed,