Dunster Castle motte, or Upper Ward, and an area below shaped to form the bailey, or Lower Ward. Somerset became more stable in the aftermath of the post-invasion period and the unsuccessful 1068 rebellion against Norman rule. It was common in the period for the Normans to build religious houses to accompany major castles, and accordingly William de Mohun endowed a Benedictine priory at Dunster in 1090, along with its parent abbey at Bath. The River Avill was important for trade; the region around Dunster was rich with fisheries and vineyards, and Dunster Castle prospered. Stone fortifications were built on the site
Dunster Castle to be stripped out as part of the renovations. As part of his work, Salvin appears to have used a number of rolled wrought-iron beams to span the resulting structural gaps in the building, an advanced use of that technology for the time. The house was refurnished with newly bought 16th and 17th-century artwork, two brass Italian cannons and a stuffed polar bear. Alexander Luttrell, who inherited Dunster Castle in 1910, chose to live at East Quantoxhead instead, and it was left empty until his son Geoffrey reoccupied the castle in 1920, redecorating some of the rooms in a contemporary