Arwen UndĂłmiel is a fictional character in J. R. R. Tolkien's Middle-earth legendarium. She appears in the novel The Lord of the Rings. Arwen is one of the half-elven who lived during the Third Age; her father was Elrond half-elven, lord of the Elvish sanctuary of Rivendell, while her mother was the Elf Celebrian, daughter of the Elf-queen Galadriel, ruler of LothlĂłrien. She marries the Man Aragorn, who becomes King of Arnor and Gondor.
In Peter Jackson's film adaptation, Arwen is played by Liv Tyler. She plays a more active role in the film than in the book, personally rescuing the Hobbit Frodo from the Black Riders at the Fords of Bruinen (a role played by Glorfindel in the book).