海岸侵食
By 1334–1335 Thanet had the highest population density in Kent according to King Edward III's lay subsidy rolls. Margate is mentioned in 1349, in a dispute about the land of Westgate Manor. Thanet acted as a granary for Calais and documents towards the end of that century refer to turreted walls beneath the cliffs needing maintenance. Coastal erosion has long since destroyed these structures.