Complete the following sentence: The Gallic Empire (Latin: Imperium Galliarum) is the modern name for a breakaway realm of the Roman Empire that existed from 260 to 274. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️ It was retaken by Roman Emperor Aurelian after the
Battle of Châlons in 274.