Political map of Europe & the Mediterranean 3 May 175 (Avidius Cassius’ Revolt): Marcus Aurelius defeated the Marcomanni and their allies in a series of campaigns from 171–5 (First Marcomannic War). Just as he was crushing the last of his enemies, rumors of Marcus’ death—allegedly fuelled by his wife Faustina (Faustina the Younger)—encouraged Avidius Cassius, governor of Syria, to proclaim himself emperor. However, as it became clear that Marcus was alive and marching south, the revolt collapsed and Cassius was murdered by his own men.