Daw's Castle (or Dart's Castle or Dane's Castle) is a sea cliff hill fort just west of Watchet, a harbour town in Somerset, England. It is a Scheduled Ancient Monument. The name comes from Thomas Dawe, who owned castell field in 1537. Excavations have revealed a first phase of defence with a mortared wall fronting an earth bank from this period. Then a second phase of defence in late 9th or early 10th centuries, also against Viking invaders. There was a plundering raid in 987, and another in 997, with much evil wrought in burning and manslaughter .