Horncastle was a small walled town in the territory of the Corieltauvi, situated at the confluence of the River Bain and the River Waring in the Lincolnshire Wolds. Occupation appears to have begun in the 1st or 2nd century CE as an open settlement, with substantial stone defences enclosing roughly 3.6 hectares (9 acres) added in the late 3rd or 4th century — part of the wider pattern of late Roman fortification of small towns in eastern Britain.
Source: Pleiades — A Community-Built Gazetteer and Graph of Ancient Places. View the Pleiades record →
Together with Caistor, Horncastle is one of the two candidates for the toponym Bannovallum ("walled place on the Bann/Bain"), recorded in the Ravenna Cosmography; its late defences suggest a role in the late Roman provincial system, perhaps as a fortified node guarding routes through the Wolds, possibly linked to coastal defence against Saxon raiding.
Substantial sections of the polygonal town wall, with characteristic external bastions of late Roman type, survive incorporated into later structures in the modern town centre (notably visible behind the public library and in St Mary's churchyard). Interior excavation has been limited and largely opportunistic, producing pottery, coins, and traces of buildings but no clear plan of internal layout, so the town's economic and civic character remains poorly understood.
Horncastle was a small walled town in the territory of the Corieltauvi, situated at the confluence of the River Bain and the River Waring in the Lincolnshire Wolds. It is recorded in the Pleiades gazetteer of ancient places as a settlement site from the Roman period in Britain.
Horncastle 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 Bannovallum (0.2 km), Two Roman barrows 180m west of Home Farm (9.1 km), Iron Age and Romano-British enclosure, S of village (16.5 km). Aubrey Research maps over 2,200 Roman sites across Britain, drawn from the Pleiades ancient world gazetteer.
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