The Secret Commonwealth of Elves, Fauns, and Fairies by Robert Kirk is a fascinating work of folklore and mythology, written in the late 17th century (1691) by a Scottish minister. It provides one of the earliest and most detailed accounts of the supernatural beings of Celtic tradition, including elves, fairies, and other "subterranean" entities. The book is considered a cornerstone of fairy lore and offers a unique glimpse into the beliefs and folklore of early modern Scotland.
Kirk's work remains a cornerstone of fairy lore studies, blending scholarship, storytelling, and mysticism in a way that continues to enchant readers centuries later.