What is "hadnock"

Hadnock is an area of farmland and woodland in Monmouthshire, Wales, north-east of Monmouth, on the east bank of the River Wye adjoining the border with England. It is located in the parish of Dixton, in the ancient manor of Hadnock, and is accessed from the road between Wyesham and Staunton. The area is thinly populated. The main properties are Hadnock Court House, a Grade II listed building originating in the 17th century, and Little Hadnock, a small hamlet which is located a few hundred yards to the north-east.