Derufin was the son of Duinhir and the brother of Duilin. Derufin was an archer of the Blackroot vale, along with his brother. They both lived during the War of the Ring. During the Battle of the Pelennor Fields, Duilin led an army of Gondor soldiers to attack the forces of Haradrim, who were riding on great Oliphaunts. Derufin led his force too close to the angry Oliphaunts, because he wanted to shoot their eyes. Derufin and his company were trampled, along with his brother Duilin.
- The Lord of the Rings: The Return of the King, Minas Tirith
- The Lord of the Rings: The Return of the King, The Battle of the Pelennor Fields