Gannys

Gannys was a Roman general who commanded the troops of Elagabalus against Emperor Macrinus in the Battle of Antioch.
According to Edward Gibbon in his Decline and Fall of the Roman Empire:
The contemporary historian Cassius Dio writes:
On the way to Rome, Elagabalus and his entourage spent the winter of 218 in Bithynia at Nicomedia, where Gannys was put to death. Cassius Dio suggests that Gannys, a virtual "foster-father and guardian" to the new emperor, was killed because he pressured Elagabalus to live "temperately and prudently":