Marcus died at the age of 58 on 17 March 180 of unknown causes in his military quarters near the city of Sirmium in Pannonia (modern Sremska Mitrovica). He was immediately deified and his ashes were returned to Rome, where they rested in Hadrian's mausoleum (modern Castel Sant'Angelo) until the Visigoth sack of the city in 410. His campaigns against Germans and Sarmatians were also commemorated by a column and a temple built in Rome. Some scholars consider his death to be the end of the Pax Romana.