Thranduil is a fictional character in J. R. R. Tolkien's Middle-earth legendarium. He first appears as a supporting character in The Hobbit, where he is simply known as the Elvenking, the ruler of the Elves who lived in the woodland realm of Mirkwood. The character is properly named in Tolkien's The Lord of the Rings, and appears briefly in The Silmarillion and Unfinished Tales.