Achaemenian's imperia (government) were established in 550 B.C, by the Median crash, by Cyrus the great. By the first battle that redounded to Median crash, Cyrus' basic theory in internal and external diplomacy, it means, "tolerance and forbearance" was founded. Kings were nearly next to this policy. Campuses followed the territorial expansion policy and after the capture of Egypt followed his fathers soft policy. Darius transformed "tolerance and forbearance" to political doctrine and endeavored to the methods peaceful ways to reach his goals.
Following the attacks Xerxes to Greece Delos confederacy led by Athens, was formed. First Artaxerxes followed the consistency and patience policy. Second Darius and Second Artaxerxes adopting the policy "divide and rule". Finally, with Macedonian attacks on Darius III, Achaemenid Empire sun life, fell.