He fought with success against the Quadi tribes, but soon left the defence of the Upper Rhine to his legates and returned to Rome, where he abandoned himself to all kinds of debauchery and excess. He also celebrated the ludi Romani on a scale of unexampled magnificence. After the death of Carus, the army in the East demanded to be led back to Europe, and Numerian, the younger son of Carus, was forced to comply. During a halt at Chalcedon, Numerian was found dead, and Diocletian, commander of the body-guards, who had claimed that Numerian had been assassinated, was proclaimed emperor by the soldiers. Carinus at once left Rome and set out for the East to meet Diocletian. On his way through Pannonia he put down the usurper Sabinus Iulianus, and encountered the army of Diocletian in Moesia. Carinus was successful in several engagements, and at the Battle of the Margus River (Morava), according to one account, the valour of his troops had gained the day, when he was assassinated by a tribune whose wife he had seduced. Carinus has the reputation of having been one of the worst of the emperors.

Main Roman Coin Book and Other References:

RIC = Mattingly, Harold    The Roman Imperial Coinage
BMC = Coins of the Roman Empire in the British Museum
RSC = Seaby, H A    Roman Silver Coinage
RCV = Sear, David R    Roman Coins and Their Values
Cr = Crawford, Michael    The Roman Republican Coinage
SB = Sear, David R    Byzantine Coins and Their Values
S = Coins of England and the United Kingdom
WW = Wildwinds.com (reference & attribution site)