Another megalithic site associated with witchcraft is the tomb known as Le Trepied, in the parish of St Saviour, Guernsey. ‘It was a notorious meeting-place for Guernsey witches, the Friday night Sabbats being sufficiently important to be attended by the devil himself, and the place is repeatedly mentioned in the witch trials of the seventeenth century.’ -- (Sir) T D Kendrick. The Archaeology of the Channel Islands. I. The Bailiwick of Guernsey. 1928, pp188-9.
From a footnote in Leslie Grinsell’s ‘Witchcraft at some prehistoric sites’, in K Briggs’s ‘The Witch Figure’ (1973).