The Usurper
From Tolkien Gateway
The Usurper was the title given to Castamir, a descendant of King Calmacil who led a revolt against Gondor's true King, Eldacar, and usurped his throne. Over the ten years of Castamir's rule, he proved to be a cruel and heartless King. His reign came to violent end when Eldacar returned from exile at the head of an avenging army.
