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Originally, a century, as the name implies, would have comprised one hundred men but, by the first century AD, the complement had been reduced to eighty, which was further divided into ten groups of eight men (contubernium), each occupying a pair of rooms (one for storage and a slightly larger area for sleeping; in the field, the men would share the same tent). Quarters for the centurion and his staff were at the end, and there were additional rooms to house recruits or immunes, those clerks or specialized craftsmen who would have been exempt from regular duty because of their skills. Six centuries, each of eighty men, would have comprised a cohort, and ten cohorts, a legion of approximately forty-eight hundred men.
The Prysg Field barracks are too extensive to appreciate on the ground and can be better seen from the air.