Aurelian turned his attention to the west and the Gallic Empire

In 274, the victorious emperor turned his attention to the west and the Gallic Empire which had already been reduced in size by Claudius II. Aurelian won this campaign largely through diplomacy; the "Gallic Emperor" Tetricus was willing to abandon his throne and allow Gaul and Britain to return to the Empire, but could not openly submit to Aurelian. Instead, the two seem to have conspired so that when the armies met at Châlons-en-Champagne that autumn, Tetricus simply deserted to the Roman camp and Aurelian easily defeated the Gallic army facing him. Tetricus was rewarded for his part in the conspiracy with a high-ranking position in Italy itself.