[1] When his father was assassinated by the vizier Artabanus, Hystaspes' younger brother Artaxerxes I ascended the throne.
[2] According to Diodorus of Sicily, Hystaspes was satrap of Bactria at the time of his father's death.
[1] This claim of Diodorus conflicts with the version of Ctesias that an Artaban (not to be confused with the murderer of Xerxes I) then led a revolt in Bactria, where he was satrap.
[citation needed] It is possible that the true rebel was Hystaspes.
[citation needed] Hystaspes was allegedly assassinated by Artaxerxes I.