Cambyses II
There are many recorded fratricides in Persia, the most famous of which involving Cyrus the Great's sons Cambyses II and Bardiya, the former killing the latter. There are also stories about the sons of Artaxerxes I, Xerxes II, Sogdianus, and Darius II, all of which concern competition for the throne. In addition, there were many fratricides recorded during the Parthian and Sassanid Empires.