The story of Tuor and Idril is one of many told briefly in the 23rd chapter of "The Silmarillion", which recounts the fall of the Noldorin city of Gondolin. A very early version, written circa 1916–17, is found in "The Book of Lost Tales II", part of "The History of Middle-earth". "Unfinished Tales" contains the start of a more mature and complete narrative, which Tolkien began after finishing "The Lord of the Rings" in the 1950s. However, it gets no further than Tuor's first sight of Gondolin. In some texts Tolkien spells his name "Tûr", but finally decided on "Tuor".