In the book Saints and Stones (ISBN 1-84323-124-7) Davies and Eastham give an account of the life of the St Brynach, a Celtic Christian who lived during the 6th Century and became a victim of his own success:
Eventually, so many people became disciples of the saint that he sought refuge in a cave on Carn Ingli – the Mount of Angels – above Nevern, where he would converse with divine messengers.