Achaemenians Hakhamanesh Persian History

The 6th century BC was witness to the establishment of these Persians in the present-day region of Fars. Fars (or Persis to the Greeks) was a recognizable district of the Assyrian Empire like the neighboring but greater Media. Persian rulers, claiming descent from one Achaemenes (or Hakhamanesh), took over the rule of Media from Astyages in the middle of the 6th century BC. In an amazingly short time Cyrus could extend his conquests from Elam and Media west and north. He pushed into Asia Minor and, upon defeating the Lydians, established the greatest Persian Empire, which was to endure long under his successors, the Achaemenians.

Link: http://www.irantour.org/Iran/history/The%20Achaemenians.html