After marrying Phaidymia, daugther of Otanes, it is said that he slew is brother Smerdis in order to protect his reign.  
This man was appointed king of the empire upon the death of his father in battle against the Massagetes.  He served as king of Babylon for a year, but later resigned after a faux pas at a religious festival and was made satrap of Bactria.  After marrying Phaidymia, daugther of Otanes, it is said that he slew is brother Smerdis in order to protect his reign.  He went on to fight Samos under Polycrates, who was allied with the Egyptians under the pharaoh Amasis in 525 BCE.  FTP, identify this second Achaemenid king and successor to Cyrus the Great.
This man was appointed king of the empire upon the death of his father in battle against the Massagetes.  
Cambyses II