Alexander the Great was unable to overthrow Darius III.
 Darius began preparations for a second force which he would command, instead of his generals; however, before the preparations were complete, Darius died, thus leaving the task to his son Xerxes
Darius's account, written at the Behistun Inscription, states that Cambyses II killed his own brother Bardiya, but that this murder was not known among the Iranian people

