Théoden is a fictional character in J. R. R. Tolkien's fantasy novel, The Lord of the Rings. The King and Lord of the Mark of Rohan, he appears as a major supporting character in The Two Towers and The Return of the King. When first introduced, Théoden is weak with age and sorrow and the machinations of his top advisor, Gríma Wormtongue, and he does nothing as his kingdom is crumbling. Once roused by Gandalf, however, he becomes an instrumental ally in the war against Saruman and Sauron.
