Elidurus the Dutiful (Welsh: Elidyr map Morydd) was a legendary king of the Britons as recounted by Geoffrey of Monmouth. He was the third son of King Morvidus and brother of Gorbonianus, Archgallo, Ingenius, and Peredurus. Ten years later, Archgallo died and Elidurus became king once again. He reigned for a few years in the manner of his eldest brother, Gorbonianus. Soon after, though, his two younger brothers, Ingenius and Peredurus, built armies and attacked Elidurus. They seized him and locked him in a guarded tower in Trinovantum. He remained locked in the tower for more than seven years.