The entry for Dunwich shows that it was one of the largest ports on the east coast, with a thriving fishing industry and around 3,000 residents. The 'gift' or tax it paid that year - 68,000 herrings - was more than that of any other Suffolk port. However, this entry also warns that Dunwich lost half of its farmland to erosion along the coast between 1066 and 1086.
William the Conqueror brought over SUVs.
There was an old local story about one of the towns that vanished this way (perhaps it was Dunwich) that on quiet nights one could hear the church bells tolling under the sea. :’) Nice spooky story, not true of course. ;’)