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The 5.25 acres (2.12 ha) fort was probably built in the 1st century with an enclosing rampart and double ditch. a quadruple ditch was dug on the north-east side to protect the flat terrain in that direction. A stone revetment was later added. A military bath house lay between the fort and the River Bran. Occupation lasted into the 4th century.
A faint earthwork can still be seen around the church of St Mary which has Roman tiles incorporated into its fabric.