He was deposed by his satrap Bessus, who then ordered his assassination in an attempt to slow the advance of an invader who had defeated this man at battles on the banks of the Pinarus and Granicus rivers.
Born with the name Codomannus, he distinguished himself in single combat against the Cadusians and was rewarded with rule over Armenia.  He came to the throne with the help of the eunuch Bagoas, who poisoned his predecessors, Arses and Artaxerxes III Ochus. He was deposed by his satrap Bessus, who then ordered his assassination in an attempt to slow the advance of an invader who had defeated this man at battles on the banks of the Pinarus and Granicus rivers. FTP, name this last Achaemenid emperor who lost the battles of Issus and Gaugamela to Alexander the Great.
Born with the name Codomannus, he distinguished himself in single combat against the Cadusians and was rewarded with rule over Armenia.  
Darius III