This large part-mounted cohort was recruited from amongst the Tungri tribe of eastern Belgica, inhabiting the western fringes of the Arduinna Silva (the Ardennes) south-east of Brussels. The evidence for this cohort in Britain is fairly substantial, though somewhat localised, there being at least 13 inscribed altarstones and tombstones naming the regiment from two separate locations. They appear to have been stationed at Birrens on the western Scottish/English border during the Antonine period and later removed to Castlesteads on Hadrian's Wall sometime during the late-2nd/early-3rd centuries.
