Hystaspes
Hystaspes (Vištâspa): name of several noble Persians and Bactrians. 

Hystaspes
The father of king Darius I was called Hystaspes; according to the Behistun inscription, he played an important role suppressing a rebellion in Parthia, where he was satrap. After Darius had killed the MagianGaumâta, the Medians revolted under their king Phraortes; the Parthians had joined him and attacked Hystaspes in the city Vishpauzâtish, but he repelled his enemies on March 8, 521 BC. After Hystaspes had received reinforcements, he was able to attack the Parthians and Hyrcanians near the Parthian town Patigrabana (July 11). This was the end of the rebellion in this part of the Persian empire. Hystaspes may have been alive as late as 495 BC.

Hystaspes
Another Vištâspa is known from the Avesta, and was a supporter of Zarathustra. This Chorasmian king is probably not identical to the father of Darius.