Opellii

Marcus Opellius Macrinus (; – June 218) was a Roman emperor who reigned from April 217 to June 218, jointly with his young son Diadumenianus. Born in Caesarea (now called Cherchell, in modern Algeria), in the Roman province of Mauretania Caesariensis to an equestrian family of Berber origins, he became the first emperor who did not hail from the senatorial class and also the first emperor who never visited Rome during his reign. Before becoming emperor, Macrinus served under Emperor Caracalla as a praetorian prefect and dealt with Rome's civil affairs. He later conspired against Caracalla and

Diadumenian ( ; ; 14September 208 – June 218) was the son of the Roman emperor Macrinus and served as his co-ruler for a brief time in 218. His mother, Macrinus' wife, is called Nonia Celsa in the unreliable , though this name may have been fictional. Diadumenian became in May 217, shortly after his father's accession to the imperial throne. Elagabalus, a relative of the recently deceased Caracalla, revolted in May of the following year, and Diadumenian was elevated to co-emperor. After Macrinus was defeated in the Battle of Antioch on 8 June 218, Diadumenian was sent to the court of Artabanus