Lebor Gabála Érenn (The Book of the Taking of Ireland) is the Middle Irish title of a loose collection of poems and prose narratives recounting the mythical origins and history of the Irish from the creation of the world down to the Middle Ages. An important record of the folkloric history of Ireland, it was compiled and edited by an anonymous scholar in the 11th century, and might be described as a mélange of mythology, legend, history, folklore and Christian historiography. It is usually known in English as The Book of Invasions or The Book of Conquests, and in Modern Irish as Leabhar Gabhála Éireann or Leabhar Gabhála na hÉireann.
Read more about Lebor Gabála Érenn: Origins, Textual Variants and Sources, Modern Criticism, Contents, O'Rahilly's Interpretation