This part-mounted unit was originally recruited from amongst the various tribes of the Gallic provinces, modern France. The Fourth Cohort of Gauls is attested on several stones from Chesterholm in Northumberland dating from the early third century through to the fourth, where it is also recorded in the Notitia Dignitatum; the unit therefore had to be stationed at Risingham sometime before the third century. The regiment is recorded on two undated tombstones from Templeborough in South Yorkshire, which was clearly an earlier posting, and a couple of undated altarstones from Castlesteads in Cumbria, on Hadrian's Wall. A detachment of the unit is also recorded on another undated building inscription recovered from High Rochester in Northumberland, the next station along the Roman road north into the Scottish Borders.
