late as the modern period, the city name was written as Wormbs. The garrison grew into a small town with a regular Roman street plan, a forum, and temples for the main gods Jupiter, Juno, Minerva (whose temple was the site of the later cathedral), and Mars. Roman inscriptions, altars, and votive offerings can be seen in the archaeological museum, along with one of Europe's largest collections of Roman glass. Local potters worked in the town's south quarter. Fragments of amphorae contain traces of olive oil from Hispania Baetica, doubtless transported by sea and then up the Rhine by ship. During the disorders of 411–413 AD, Roman usurper Jovinus established himself in Borbetomagus as a puppet-emperor with the help of King Gunther of the Burgundians, who had settled in the area between the Rhine and Moselle some years before. The city became the capital of the Burgundian kingdom under Gunther (also known as Gundicar). Few remains of this early Burgundian kingdom survive, because in 436, it was all but destroyed by a combined army of Romans (led by Aëtius) and Huns (led by Attila); a belt clasp found at Worms-Abenheim is a museum treasure. Provoked by Burgundian raids against Roman settlements, the combined Romano-Hunnic army destroyed the Burgundian army at the Battle of Worms (436), killing King Gunther. About 20,000 are said to have been killed. The Romans led the survivors southwards to the Roman district of Sapaudia (modern-day Savoy). The story of this war later inspired the Nibelungenlied. The city appears on the Peutinger Map, dated to the fourth century. Middle Ages The bishopric of Worms existed by at least 614. In the Frankish Empire, the city was the location of an important palace of Charlemagne. The bishops administered the city and its territory. The most famous of the early medieval bishops was Burchard of Worms. In 868, an important synod was held in Worms. Around 900, the circuit wall was rebuilt according to the wall-building ordinance of Bishop Thietlach. Worms prospered in the High Middle Ages. Having received far-reaching privileges from King Henry IV as early as 1074, the city became an imperial free city. The bishops resided at Ladenburg and only had jurisdiction over Worms Cathedral itself. In 1122, the Concordat of Worms was signed; the 1495 imperial diet met here and made an attempt at reforming the disintegrating Imperial Circle Estates by the Imperial Reform. Most