Iran is a founding member of the UN, ECO, NAM, OIC, and OPEC.
It is a major regional and middle power, – exert considerable influence in international energy security and the world economy.
Iran made major contributions to the Islamic Golden Age that followed, producing many influential figures in art and science.
After two centuries, a period of various native Muslim dynasties began, which were later conquered by the Turks and the Mongols.
The unification of the Median tribes under king Deioces in 728 BC led to the foundation of the Median Empire which, by 612 BC, controlled almost the entire territory of present-day Iran and eastern Anatolia.
539 BC was the year in which Persian forces defeated the Babylonian army at Opis, and marked the end of around four centuries of Mesopotamian domination of the region by conquering the Neo-Babylonian Empire.