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 to the castle were undertaken by Henry Fownes Luttrell who had acquired it through marriage to Margaret Fownes-Luttrell in 1747. Following the death of Alexander Luttrell in 1944, the family was unable to afford the death duties on his estate. The castle and surrounding lands were sold off to a property firm, the family continuing to live in the castle as tenants. The Luttrells bought back the castle in 1954, but in 1976 Colonel Walter Luttrell gave Dunster Castle and most of its contents to the National Trust, which operates it as a tourist attraction. It is a Grade I