The motte at Caerwent is a subcircular, originally ditched, mound about 24m in diameter raised over the south-eastern angle of the defences of the Roman town (Nprn93753).
A 'castell of Gwent' is mentioned in about 1150.

Sources:
OS record card ST49SE40.
RCAHMW air photos: 945067/48-9; 955221/66.

J.Wiles 24.02.03