He is also known for defeating the Croesus, King of Lydia, and establishing his empire by overthrowing the Medians.
An imposter named Gaumata took the identity of this ruler's son Bardiya to overthrow this ruler's rightful successor. That successor fought at the Battle of Pelusium and defeated Psametik III, pharaoh of the 26th Dynasty. Xenophon wrote a fictionalized biography of this ruler, whose head was supposedly placed in a jar of blood by the vengeful Queen Tomyris of the Massagatae. He founded his capital at Pasargade, although the city that he conquered from his grandfather Astyages, Ecbatana, also served that function. After having defeated the Neo-Babylonians under Nabonidus, he made the Jews happy by ending the Babylonian Captivity. He is also known for defeating the Croesus, King of Lydia, and establishing his empire by overthrowing the Medians. Father of Cambyses II, for 10 points, identify this founder of the Achaemenid dynasty of the Persian empire.
An imposter named Gaumata took the identity of this ruler's son Bardiya to overthrow this ruler's rightful successor.
Cyrus II or the Great [accept just Cyrus after the end of the question; prompt otherwise; accept Kurus]