https://en.wikipedia.org/wiki/Robert_Kirk_(folklorist)
Robert Kirk (9 December 1644 – 14 May 1692) was a minister, Gaelic scholar and folklorist, best known for The Secret Commonwealth, a treatise on fairy folklore, witchcraft, ghosts, and second sight, a type of extrasensory perception described as a phenomenon by the people of the Scottish Highlands.
Kirk died before he was able to publish The Secret Commonwealth. Legends arose after Kirk's death saying he had been taken away to fairyland for revealing the secrets of the Good People.
http://www.martinshaven.com/Resources/Kirk Secret Commonwealth.pdf