Glanum was a former Roman colony. Glanum was destroyed by the Alamanni in 260 and was subsequently abandoned, its inhabitants moving a few miles north into the plain to found a city that later was named Saint-Rémy-de-Provence. Glanum was not excavated until 1921, but has since become one of the most important Roman excavations in France. Glanum possesses an impressive triumphal arch, erected between 10 and 25 AD, making it the oldest to be found in Gaul. It portrays Gaulish captives being led away in chains by the victorious Romans.