Babylonian rebel leader and pretender to the throne of Babylonia. His proper name was Arakha, and he was probably of Aramean ascendency. He rose in rebellion against Persian power after the death of Cambyses II, and for a few months was recognized as king in the southern parts of Babylonia. He is attested in economic texts from May to November 521. He was defeated and captured by Darius I in Babylon.