The Persian Empire is any of a series of imperial dynasties centered in Persia (now Iran and Afghanistan) with boundaries that ebbed and flowed from that core. The first of these was established by Cyrus The Great over 2,500 years ago, in 550 BC, but the existence of dynastic rule centered in the region was absent after series of foreign invasions...
Found on
http://en.wikipedia.org/wiki/Persian_Empire
The last major empire of Ancient Mesopotamia, the Persian Empire conquered much of the Middle East.
Found on
http://www.ducksters.com/history/mesopotamia/glossary%20and_terms.php
noun an empire in southern Asia created by Cyrus the Great in the 6th century BC and destroyed by Alexander the Great in the 4th century BC
Found on
https://www.encyclo.co.uk/local/20974
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