Like his predecessors, Gallus did not have an easy reign. In the East, an Antiochene nobleman, Mariades, revolted and began ravaging Syria and Cappadocia, then fled to the Persians. Gallus ordered his troops to attack the Persians, but Persian Emperor Shapur I invaded Armenia and destroyed a large Roman army, taking it by surprise at Barbalissos in 253. Shapur I then invaded the defenseless Syrian provinces, capturing all of their legionary posts and ravaging their cities, including Antioch, without any response. Persian invasions were repeated in the following year, but now Uranius Antoninus (a priest originally called Sampsiceramus), a descendant of the royal house of Emesa, confronted Shapur and forced him to retreat. Uranius proclaimed himself emperor, however, and minted coins with his image upon them. On the Danube, Scythian tribes were once again on the loose, despite the peace treaty signed in 251. They invaded Asia Minor by sea, burned the great Temple of Artemis at Ephesus, and returned home with plunder. Lower Moesia was also invaded in early 253. Aemilian, governor of Moesia Superior and Pannonia, took the initiative and defeated the invaders.
Like his predecessors, Gallus did not have an easy reign. In the East an Antiochene nobleman, Mariades, revolted and began ravaging Syria and Cappadocia, then fled to the Persians. Gallus ordered his troops to attack the Persians, but Persian Emperor Shapur I invaded Armenia and destroyed a large Roman army, taking it by surprise at Barbalissos in 253. Shapur I then invaded the defenseless Syrian provinces, capturing all of their legionary posts and ravaging their cities, including Antioch, without any response. Persian invasions were repeated in the following year, but now Uranius Antoninus (a priest originally called Sampsiceramus), a descendant of the royal house of Emesa, confronted Shapur and forced him to retreat. Uranius proclaimed himself emperor, however, and minted coins with his image upon them On the Danube, Scythian tribes were once again on the loose, despite the peace treaty signed in 251. They invaded Asia Minor by sea, burned the great Temple of Artemis at Ephesus, and returned home with plunder. Lower Moesia was also invaded in early 253 Aemilian, governor of Moesia Superior and Pannonia, took the initiative and defeated the invaders.