Aurelius Arpagius was a governor of one of the provinces of Roman Britain

Roman Britain

Roman Britain was the part of the island of Great Britain controlled by the Roman Empire from AD 43 until ca. AD 410.The Romans referred to the imperial province as Britannia, which eventually comprised all of the island of Great Britain south of the fluid frontier with Caledonia...

, probably Britannia Secunda

Britannia Secunda

Britannia Secunda was one of the provinces of Roman Britain in existence by c. 312 AD and probably created as part of the administrative reforms of the Roman Emperor Diocletian after the defeat of the usurper Allectus by Constantius Chlorus in 296 AD. The governors of Britannia Secunda were of...

. He is known from a single building inscription from Birdoswald (RIB 1912) which describes the rebuilding of several buildings at the fort under the Tetrarchy, it dates to the period AD296-305.

This was just after Rome had retaken Britain from Allectus

Allectus

Allectus was a Roman usurper-emperor in Britain and northern Gaul from 293 to 296.-History:Allectus was treasurer to Carausius, a Menapian officer in the Roman navy who had seized power in Britain and northern Gaul in 286...

. The case is often made that there was significant unrest under his reign. Yet there is very little firm evidence that there any significant violence in this period.