Isca Silurum

(Caerleon)

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Situated in the territory of the Silures (southeast Wales), on a river of the same name (Usk). Isca was made the headquarters of a legion (moved from Isca Dumnoniorum [Exeter] by Sextus Julius Frontinus during his conquest of Wales in AD 74/75; perhaps part of the legion had already been there from c 56). Originally built of timber banked up with clay, the defences of Silurian Isca were strengthened with stonework (99/100), and after a period of decline were again repaired under the Severi and Valerian (253–60); though before the end of the third century, and probably earlier, the legion had gone. Its allocation to provinces corresponded with that of Isca Dumnoniorum (qv). Isca Silurum was traditionally believed to have been the seat of an archbishopric, but this is unlikely.

Surviving remains of the stronghold, which has been carefully explored, include the legionary commander's residence (praetorium), administrative headquarters (principium), with internal colonnades, barrack-blocks, hospital (with operating theater), cook-houses, latrines, large drill-hall, heated baths, and building for athletics and wrestling (palaestra). An adjoining civilian settlement (canabae), which remained small because the town of Venta Silurum [Caerwent] was not far away, is shown by inscriptions to have included temples of Diana, Mithras and Jupiter Dolichenus. An amphitheater (no doubt for purposes of military training) and bathing establishment are just outside the fortress wall, and wharves have been excavated on the river.