Imperio galo
During the Crisis of the Third Century, from 260 to 274, Gaul was subject to Alamanni raids during the civil war. In reaction to local problems the Gallo-Romans appointed their own emperor Postumus. The rule over Gaul, Britannia, and Hispania by Postumus and his successors is usually called "The Gallic Empire" although it was just one set of many usurpers who took over parts of the Roman Empire and tried to become emperor. The capital was Trier which was often used as the northern capital of the Roman Empire by many emperors. The Gallic Empire ended when Aurelian decisively defeated Tetricus I at Chalons.