The Alamanni were continually engaged in conflicts with the Roman Empire. They launched a major invasion of Gaul and northern Italy in 268, when the Romans were forced to denude much of their German frontier of troops in response to a massive invasion of the Goths from the east. Their raids throughout the three parts of Gaul were traumatic: Gregory of Tours (died ca 594) mentions their destructive force at the time of Valerian and Gallienus (253–260), when the Alemanni assembled under their "king", whom he calls Chrocus, who "by the advice, it is said, of his wicked mother, and overran the whole of the Gauls, and destroyed from their foundations all the temples which had been built in ancient times. And coming to Clermont he set on fire, overthrew and destroyed that shrine which they call Vasso Galatae in the Gallic tongue," martyring many Christians (Historia Francorum Book I.32–34). Thus 6th century Gallo-Romans of Gregory's class, surrounded by the ruins of Roman temples and public buildings, attributed the destruction they saw to the plundering raids of the Alemanni.
Roman-Alamannic Wars - Wikipedia, the free encyclopedia