sentences:  This became the name for the first two volumes of "The History of Middle-earth", which include these early texts.Tolkien never completed "The Book of Lost Tales"; he left it to compose the poems "The Lay of Leithian" and "The Lay of the Children of Húrin".The first complete version of "The Silmarillion" was the "Sketch of the Mythology" written in 1926 (later published in Volume IV of "The History of Middle-earth").