Caister-on-Sea was a Roman coastal fort established in the early third century A.D. (c. 200) on what was then a sheltered estuary at the mouth of the Yare, opposite Burgh Castle. Roughly 3.5 hectares within its walls, it housed a garrison likely engaged in maritime activity, and remained occupied into the late fourth century, though with apparent changes in character over time.
Source: Pleiades — A Community-Built Gazetteer and Graph of Ancient Places. View the Pleiades record →
Together with Burgh Castle (Gariannonum), Caister controlled the large tidal estuary providing access to the Norfolk hinterland, and it is often discussed in relation to the developing Saxon Shore system, though its earlier foundation date and somewhat different plan suggest it predates that coordinated coastal defence. Its function may have been as much logistical and naval — protecting shipping and a harbour — as purely defensive.
Excavations by Charles Green (1951–55) and later work revealed a defensive wall with external ditch, a south gate, an internal road, and a series of stone buildings including a substantial structure (Building 1) interpreted variously as a barrack block, mansio, or seamen's hostel, along with later inhumation burials cut into the site indicating sub-Roman or early Anglo-Saxon reuse. Finds of coins, pottery, and metalwork support continuous occupation from c. 200 to the late fourth century, though the full plan of the interior remains only partially understood.
Caister-on-Sea was a Roman coastal fort established in the early third century A.D. It is recorded in the Pleiades gazetteer of ancient places as a fort site from the Roman period in Britain.
Caister-on-Sea 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 Burgh Castle Roman fort, vicus, pre-Conquest monastery and Norman motte and bailey castle (8.8 km), Roman camp and settlement site W of Horstead (26.6 km), Roman sites outside town walls (28.9 km). Aubrey Research maps over 2,200 Roman sites across Britain, drawn from the Pleiades ancient world gazetteer.
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