Atropates
When Darius lost he went to the Median capital of Ecbatana. Atropates helped him. Darius tried to get a new army but could not.  He left Ecbatana in June 330 BCE. After Darius' death a month later at the hands of Bessus, Atropates surrendered to Alexander. Alexander first chose Oxydates as satrap of Media.  In 328-327 BCE Alexander did not trust in Oxydates' loyalty.  Atropates was made satrap again. In 325-324, Atropates gave Baryaxes (a rebel of the area) to Alexander. Alexander thought highly of Atropates.