Reichskrise des 3. Jahrhunderts
In the Crisis of the Third Century around 260, Postumus established a short-lived Gallic Empire, which included the Iberian Peninsula and Britannia, in addition to Gaul itself. Germanic tribes, the Franks and the Alamanni, invaded Gaul at this time. The Gallic Empire ended with Emperor Aurelian's victory at Châlons in 274.