Anshan (or Anzan) (in Persian انشان) was also a city and small kingdom in Persia (Iran) during the 1st millennium BC, ruled by the Achaemenid dynasty. Persian prince Teispes (675-640) captured the Elamite city of Anshan and called himself "King of the City of Anshan". Anshan embarked on a period of conquest in the 6th century BC and became the nucleus of the Persian empire.
Cyrus was certainly of Persian extraction, but when he founded his empire he was Prince of Elam (Anzan), and he merely added Media and Persia to his dominion.
Towards the middle of the sixth century B.C., and a few years after the death of Nebuchadnezzar (Nabuchodonosor) the Great, King of Babylon (605-562 B.C.), Western Asia was divided into three kingdoms: the Babylonian Empire, Media, and Lydia; and it was only a question of time which of the three would annihilate the other two.
Astyages (585-557 B.C.), the successor of Cyaxares (625-585 B.C.), being engaged in an expedition against Babylonia and Mesopotamia, Cyrus, Prince of Anzan, in Elam, profiting by his absence, fomented a rebellion in Media.