Fians, Fairies and Picts

'Fians, Fairies and Picts' is a non-fiction book written by David MacRitchie. He was a Scottish folklorist and antiquarian. MacRitchie proposed that stories of fairies originated with an aboriginal race that occupied the British Isles before Celts and other groups arrived; a theory called Fairy Euhemerism, which he discusses in detail in this book.