Southwold was mentioned in "Domesday Book" (1086) as a fishing port, and after the "capricious River Blyth withdrew from Dunwich in 1328, bringing trade to Southwold in the 15th century", it received its town charter from Henry VII in 1489. Over the following centuries, however, a shingle bar built up across the harbour mouth, preventing the town from becoming a major Early Modern port: "The shingle at Southwold Harbour, the mouth of the Blyth, is ever shifting," William Whittaker observed in 1887.