Eynsford Castle

Eynsford Castle is a ruined medieval fortification in Eynsford, Kent. Built on the site of an earlier Anglo-Saxon stone burh, the castle was constructed by William de Enysford, probably between 1085 and 1087, to protect the lands of Lanfranc, the Archbishop of Canterbury, from Odo, the Bishop of Bayeux. It comprised an inner and an outer bailey, the former protected by a stone curtain wall. In 1130 the defences were improved, and a large stone hall built in the inner bailey.

Source: Wikipedia