Dux Syriae

[Nathan Ross]

Where would he have been headquartered in AD 393?

According to the passio of SS Sergius and Bacchus, which supposedly dates from the persecution of either Diocletian or Julian, but which was recorded in the later 4th century and probably has details from that era, the Dux Syriae et Euphratensis had his headquarters at Barbalissos.

Antioch was the base of the Comes Orientis, the Consularis Syriae, the Praetorian Prefect and court of the east, and the Magister Equitum per Orientum.

(all these details are from Liebeschuetz (1972), Antioch: city and imperial administration in the later Roman Empire.)