This invasion was quickly defeated by the Roman cavalry and infantry. In the aftermath the military governor of Pannonia, Iallius Bassus, initiated negotiations with 11 tribes. The Marcomannic king Ballomar, a Roman client, acted as the main negotiator for the tribes. In 168 the Marcomanni and Victohali again crossed the Danube into Pannonia, but when a Roman army advanced to Carnuntum they withdrew, promising good conduct. A much more serious invasion occurred in 169, when Ballomar formed a coalition of Germanic tribes that crossed the Danube and won a decisive victory over a force of 20,000 Roman soldiers near Carnuntum. Ballomar then led the larger part of his host southwards towards Italy, while the remainder ravaged Noricum. The Marcomanni razed Opitergium (Oderzo) and besieged Aquileia. The army of praetorian prefect Furius Victorinus tried to relieve the city, but was defeated and its general slain. The Romans reorganized, brought in fresh troops and managed to eventually evict the invaders from Roman territory by the end of 171. Roman counter-offensives, 172–174 Marcus Aurelius started the invasion of what are now Slovak territories in 172 AD, when the Romans crossed the Danube into Marcomannic territory. Although few details are known, the Romans achieved success, subjugating the Marcomanni and their allies, the Varistae or Naristi and the Cotini. After the 172 campaigning season Marcus and Commodus were both given the title "Germanicus", and coins were minted with the inscription "Germania subacta" (subjugated Germany). The Marcomanni were subjected to a harsh treaty. In 173 AD the Romans campaigned against the Quadi, who had broken their treaty and assisted their kin, the Marcomanni. The Quadi were defeated and subdued. In 174 AD Marcus Aurelius penetrated deeper into the river valleys of Váh, Nitra and Hron, where there are Roman marching camps like Laugaricio. On the banks of the Hron he wrote his philosophical work "Meditations". In the same year, the legions of Marcus Aurelius again marched against the Quadi. In response, the Quadi deposed their pro-Roman king, Furtius, and installed his rival Ariogaesus in his place. Marcus Aurelius refused to recognize Ariogaesus, and after his capture exiled him to Alexandria. By late 174, the subjugation of the Quadi was complete. Rebellion of Avidius Cassius, 175–176 Marcus Aurelius may have intended to campaign against the remaining tribes of the area that is now western Slovakia and Bohemia, and together with his recent conquests establish two new Roman