3rd century units serving under Postumus to Tetricus

[Agraes]

A fellow re-enactor has the plan to launch a group reproducing military and civil life in 3rd century Gaul. His main emphasis is on the 'gallic empire', from Postumus to Tetricus. He is looking for informations about the units - preferably auxiliae - that made up their armies. I read those were mostly vexillatio from British and Rhenish legions. Is there any source of their name?