Bitterne, ancient Clausentum, was a small fortified Roman settlement on a promontory in the River Itchen estuary at modern Southampton. Occupied from the mid-1st century AD into the late 4th century, it functioned as a port and probable supply base, with substantial late Roman defences (stone walls and ditches cutting off the peninsula) added in the 3rd–4th century, transforming it into a defended coastal site of the kind associated with the Saxon Shore system, though it is not listed in the Notitia Dignitatum.
Source: Pleiades — A Community-Built Gazetteer and Graph of Ancient Places. View the Pleiades record →
Clausentum served as a significant harbour on the south coast, likely linked to the supply network feeding Winchester (Venta Belgarum) and the wider region, and may have played a role in late Roman coastal defence and cross-Channel traffic. Its identification with the Clausentum of the Antonine Itinerary (Iter VII) is generally accepted though not certain.
Excavations, notably by M. Aylwin Cotton and others in the 1950s and earlier work by Waterman, revealed the defensive wall and ditch, masonry buildings including a probable bath-house, quantities of imported pottery and coinage extending into the late 4th century, and evidence of waterfront structures. Modern urban development on the Bitterne Manor peninsula has limited recent investigation, and much of the interior plan remains poorly understood.
Bitterne, ancient Clausentum, was a small fortified Roman settlement on a promontory in the River Itchen estuary at modern Southampton. It is recorded in the Pleiades gazetteer of ancient places as a settlement site from the Roman period in Britain.
Bitterne is classified as a Roman settlement — a civilian 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 Bitterne (Clausentum) Roman station (0.8 km), Roman piers and revetment in the River Itchen (1 km), Eastern aqueduct and the water catchment area of a western aqueduct, at Netley Abbey (3.4 km). Aubrey Research maps over 2,200 Roman sites across Britain, drawn from the Pleiades ancient world gazetteer.
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