In 1691, an account appeared of a haunting that took place in 1665 at a house called “Llanellan”, which belonged to Lieutenant Colonel Bowen. He was one of Cromwell’s officers during the Civil War, and regarded as a wild character in many respects. The phenomena started when Bowen was away in Ireland. The first in a series of phenomena were “alarming noises”, followed by the sounds of a “whirl-wind”. Then the apparition of a man appeared to Mrs. Bowen, which was similar in appearance to her husband. It demanded to get into bed with her, but she and her servants kept it at bay with prayer.
Unconfirmed
For further information, please read Haunted Wales: A Guide to Welsh Ghostlore by Richard Holland.