Tuor's story is one of many told briefly in the 23rd chapter of The Silmarillion. 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.