Marcus Aurelius Probus, born AD 232 in Sirmium, succeeded Tacitus as emperor from AD 276-282, toward the end of the Crisis of the Third Century which would end in AD284 with the rule of Diocletian. At the death of Tacitus, Probus held the chief command in Asia which he received from Tacitus. The reverse shows Sol Invictus, a monotheistic divinity promoted by Aurelian, emperor AD 270-275, who attempted to promote religious and cult unity throughout the empire. During his brief reign, he put down at least four revolts, the last from the next emperor Carus; he was assassinated by his own troops on his way back to Rome, ironically at Sirmium, his birthplace. The mint is either Cyzicus or Antioch. Alan Harway 2011.