Dunster Castle Castle and most of its contents to the National Trust, which operates it as a tourist attraction. It is a Grade I listed building and scheduled monument. Dunster Castle was positioned on a steep, high hill, sometimes called the Tor, overlooking the village of Dunster in Somerset. During the early medieval period the sea reached the base of the hill, close to the mouth of the River Avill, offering a natural defence and making the village an inland port. Several Iron Age hillforts were built close to Dunster, including Bat's Castle, Black Ball Camp and Grabbist Hill, but the earliest
Dunster Castle during the early 12th century, probably forming a shell keep around the top of the motte. In the late 1130s England began to descend into a period of civil war known as the Anarchy, during which the supporters of King Stephen fought with those of the Empress Matilda for control of the kingdom. William de Mohun's eldest son, also called William, was a noted supporter of Matilda, and Dunster was considered one of her faction's strongest castles in the south-west. In 1138 forces loyal to Stephen besieged the castle; a siege castle was built nearby, but all trace of it