 The story of this continuous redrafting is told in the posthumous series "The History of Middle-earth", edited by Tolkien's son, Christopher Tolkien.From around 1936, Tolkien began to extend this framework to include the tale of "The Fall of Númenor", which was inspired by the legend of Atlantis.Tolkien had appointed his son Christopher to be his literary executor, and he (with assistance from Guy Gavriel Kay, later a well-known fantasy author in his own right) organized some of this material into a single coherent volume, published as "The Silmarillion" in 1977.