Leucarum, modern Loughor in Swansea, was a Roman auxiliary fort guarding the lowest crossing of the River Loughor on the road between Nidum (Neath) and Moridunum (Carmarthen). Founded c. AD 75 during the Flavian conquest of the Silures under Frontinus or Agricola, it was occupied intermittently into the late 3rd or early 4th century, with phases of timber and later stone defences enclosing roughly 2.3 hectares.
Source: Pleiades — A Community-Built Gazetteer and Graph of Ancient Places. View the Pleiades record →
It formed a key link in the lateral road across South Wales connecting the legionary fortress at Caerleon (Isca) with the western forts, and its strategic position at a tidal river crossing gave it both military and economic importance. The unusually late activity at the site sets Leucarum apart from many South Welsh auxiliary forts, which were typically abandoned by the mid-2nd century.
Extensive excavations directed by A. G. Marvell and H. S. Owen-John in the 1980s revealed multiple structural phases including timber barracks, granaries, a stone-built bath-house, and rampart sequences, together with substantial 3rd–4th century material suggesting reoccupation. The remains lie partly beneath the Norman castle ringwork, which sits atop the fort's south-east corner — a striking superimposition of two military horizons.
Leucarum, modern Loughor in Swansea, was a Roman auxiliary fort guarding the lowest crossing of the River Loughor on the road between Nidum (Neath) and Moridunum (Carmarthen). It is recorded in the Pleiades gazetteer of ancient places as a fort site from the Roman period in Britain.
‘Leucaro’ is classified as a Roman fort — a military site in the Pleiades ancient world gazetteer. Roman Britain's archaeology encompasses thousands of sites ranging from legionary fortresses and marching camps to villas, temples and towns.
Several Roman sites lie within a short distance, including ‘Nido’ (18.3 km), Abercyfor (23.8 km), Dynevor Park (25.2 km). Aubrey Research maps over 2,200 Roman sites across Britain, drawn from the Pleiades ancient world gazetteer.
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