Dunster Castle evidence of a fortification at Dunster was an Anglo-Saxon "burgh". This was built on the summit of the hill and was possibly intended to protect the region against sea-borne raiders; by the mid-11th century it was controlled by a local nobleman called Aelfric. In 1066 the Normans invaded south-east England, defeating the English forces at the battle of Hastings: in the aftermath of the victory, William the Conqueror entrusted the conquest of the south-west of England to his half-brother Robert of Mortain. Expecting stiff resistance, Robert marched west into Somerset, supported by forces under Walter of Douai, who entered from
Dunster prosperity of Dunster was based on the wool trade, with profits helping to pay for the construction of the tower of the Priory Church of St George and provide other amenities. The 15th century Gallox Bridge was one of the main routes over the River Avill on the southern outskirts. The market was held in "The Shambles" however these shops were demolished in 1825 and now only the Yarn Market remains. Dunster Beach, which includes the mouth of the River Avill, is located half a mile from the village, and used to have a significant harbour, known as Dunster Haven,