Macrinus and Diadumenianus
Macrinus came from an equestrian family; Dio Cassius writes that he was a Moor from Caesarea. Note that he did not style himself "Caesar", but did add "Severus" to his name and inserted Pius Felix before the title "Augustus". He raised his son Diadumenianus to be co-Emperor with him.
- Macrinus ("Imp. M. Opellius Severus Macrinus P.F. Augustus"; b. M. Opellius Macrinus), 217– 218
- Diadumenianus ("Imp. Caesar M. Opellius Antoninus Diadumenianus Aug."; b. M. Opellius Diadumenianus), 218
Macrinus was praetorian prefect (praefectus praetorio) under "Caracalla", whom he may have conspired to murder in April 217. His wife Nonia Celsa bore him a son, Diadumenianus, whom he made co-Emperor in 218; both were executed by partisans of "Elagabalus" (see below).
Read more about this topic: Roman Emperor (Principate)