The Book of Dimma (now TCD MS 59) and its shrine were purchased by Mr. Henry Monck Mason from a Dr. Thomas Harrison of Nenagh (Tipperary) in the early 19th century. They first came to public attention in 1816 when Monck Mason, librarian at the King’s Inns in Dublin, brought them to be exhibited at the Society of Antiquaries in London (then at Somerset House; fig. 1).

On May 24th 1819, when Monck Mason presented the manuscript and its shrine at the Royal Irish Academy, he explained that, according to Dr Harrison, Continue reading The Devil’s Caves…