We may illustrate their character from Housesteads, which, in the form in which we know it, perhaps dates from Septimius Severus.
Close by were officers' quarters, generally built round a tiny cloistered court (ix., xi., xii.), 0 'Borcovicium (HousEsrf aas) ' - Plan of Housesteads (Borcovicium) on Hadrian's Wall.
Of the English examples a few have been carefully excavated, notably Gellygaer between Cardiff and Brecon, one of the most perfect specimens to be found anywhere in the Roman empire of a Roman fort dating from the end of the ist century A.D.; Hardknott, on a Cumberland moor overhanging Upper Eskdale; and Housesteads on Hadrian's wall.
C. Bosanquet, Roman Camp at Housesteads (Newcastle, 1904).