[Ir. dún mór, big fortress].
Huge, three-chambered cave in Co. Kilkenny, about 6 miles N of Kilkenny city. Widely known in Old Irish literature and in folklore as the darkest place in Ireland, Dunmore was the home of the monster cat Luchtigern. The cave was plundered in 928 by Godfrey and the Vikings of Dublin, who reputedly slaughtered more than 1,000 people; numerous human bones found in the cave are thought to bear testimony to this event. Also known as Derc Ferna.