Gaius Julius Priscus [SEP] father
Gaius Julius Priscus
Gaius Julius Priscus (fl. 3rd century) was a Roman soldier and member of the Praetorian Guard in the reign of Gordian III.
Priscus was born in the Roman province of Syria, possibly in Damascus, son of a Julius Marinus a local Roman citizen, possibly of some importance. The name of his mother is unknown, but his brother was Marcus Julius Philippus, later the Roman Emperor known as "Philip the Arab". 
Priscus was probably older than Philip, since the latter's
the enemy's territory, when his father-in-law died in unclear circumstances. Without Timesitheus, the campaign, and the Emperor's security, were at risk.
Gaius Julius Priscus and, later on, his own brother Marcus Julius Philippus, also known as Philip the Arab, stepped in at this moment as the new Praetorian Prefects and the campaign proceeded. Around February 244, the Persians fought back fiercely to halt the Roman advance to Ctesiphon. 
The eventual fate of Gordian after the battle is unclear.