224 - 642 The Sasanian Dynasty.
570 - The Prophet Mohammad was born.
632 - The Prophet Mohammad died and his teachings were compiled into the Koran, the holy book of Islam.
642 - 1220 The Arab Caliphate.
1220 - Mongol Era when Persia conquered by Gangis Khan.
1271 - Marco Polo journeyed through Persia en route to China
1295 - Ghazan Khan became the first Mongol leader to convert to Islam
1501-1524 - Safavid Dynasty started by Shah Ismail I who united all of Persia under Iranian leadership
1795 - Qajar Dynasty
1851-1906 - The Qajars lost central Asian provinces to the Russians and were forced to give up all claims on Afghanistan to Great Britain
1925-1940 - Pahlavi Dynasty
1979 - The Shah was overthrown by the Islamic Revolution ending 2,500 years of monarchy
July 29, 1980 - The Islamic Revolution

This information focuses on the history of Iraq and does not address modern-day events