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The Achaemenid Empire lasted from 550 to 330 B.C.E. It was formed when Cyrus the Great defeated King Astyages.
http://www.metmuseum.org/toah/hd/acha/hd_acha.htm -
Darius the Great was a Persian king who ruled from 522 to 486 B.C.E.
http://media.pearsoncmg.com/ph/hss/SSA_SHARED_MEDIA_1/history/MHL/WW/documents/Darius_Great_Ruler_of_Persia522_BCE_1.html -
The Seleucid Empire was founded by Seleucus nictator shortly after the division of the Macedonian Empire. Seleucus was able to successfully establish a dynasty that lasted for two centuries.
http://www.metmuseum.org/toah/hd/sleu/hd_sleu.htm -
The Parthian Empire began in 247 B.C. Their power was dominant in the East, they were responsible for influncing politics from Asia Minor to India until they were overthrown in 224.
http://www.metmuseum.org/toah/hd/part/hd_part.htm -
The Sasanian Empire was the last Persian Empire. This time period is considered by Iranian people to be the highlight of their civilization.
http://www.ancient.eu/Sasanian_Empire/