Dinedor features quite extensively in Phil Rickman's 1999 novel MIDWINTER OF THE SPIRIT, set in the Hereford area. An archaeologist who believes she's psychically linked with the original inhabitants comes to a sticky end on the hill, but that's just one strand in an absorbing tale brilliantly told.
Libraries tend to file Rickman under Horror, or sometimes Crime, should you wish to hunt down a copy.
.
Something is not right. This message is just to keep things from messing up down the road