provinces, Marcomannia and Sarmatia, but whatever his plans, they were cut short by the rebellion of Avidius Cassius in the East. Marcus Aurelius marched eastwards with his army, accompanied by auxiliary detachments of Marcomanni, Quadi, and Naristi under the command of Marcus Valerius Maximianus. After the successful suppression of Cassius' revolt, the emperor returned to Rome for the first time in nearly 8 years. On 23 December 176 AD, together with his son Commodus, he celebrated a joint triumph for his German victories ("de Germanis" and "de Sarmatis"). In commemoration of this, the Aurelian Column was erected, in imitation of Trajan's Column. Second Marcomannian campaign, 177–180 In 177 AD, the Quadi again rebelled, soon followed by their neighbours, the Marcomanni. After delays, Marcus Aurelius headed north on 3 August 178 to begin his second Germanic campaign, too late for serious action that year. Publius Tarrutenius Paternus was given supreme command in the campaigning season of 179. The main enemy seems to have been the Quadi and results were positive. The next year, on 17 March 180, the emperor died at Vindobona (modern Vienna), or perhaps at Bononia on the Danube, to the north of Sirmium. He probably died of plague. His death happened just before the campaigning season began, and when his dream of creating the provinces of Marcomannia and Sarmatia seemed close to fulfillment. Subsequent Roman influence When Commodus succeeded Marcus Aurelius he had little interest in pursuing the war. Against the advice of his senior generals, he negotiated a peace treaty with the Marcomanni and the Quadi, where he agreed to withdraw south of the Danube Limes. Commodus left for Rome at the end of 180 AD, where he celebrated a triumph. Romanization of the barbarian population continued in the late Roman period (181-380 AD). Many Roman-style buildings with evidence of trade with the Roman Empire were built in what is now south-western Slovakia at Bratislava, Dúbravka, Cífer, Pác and Veľký Kýr. Roman influence can be also seen in baths, coins, glass and amphorae dated to this period. The Marcomanni converted to Christianity towards the end of the fourth century when Fritigil, their queen, obtained help from Ambrose, the formidable bishop of Milan (Italy), and also persuaded her husband to place himself and his people under Roman protection. Disintegration In 373 AD, hostilities erupted between the Romans and the Quadi, who were outraged that Valentinian I was building