People who living in western Asia were the First residents of IRAN. When the Aryans arrived, they gradually started mingling with the old native Asians. Aryans were a tributary of the people today known as the Indo-Europeans, and are believed to be the grandfathers of the people of present India, Iran, and most of Western Europe.
Recent discoveries show that, centuries before the rise of earliest culture in Mesopotamia, Iran was inhabited by humans. But the written history of Iran dates back to 3200 B.C. and begins with the early Achaemenian, The dynasty that blossomed under the first Iranian world empire.
The founder of this dynasty was Cyrus the Great; he and his empire are the first to establish the charter of human rights. In this period Iran stretched from the Aegean coast of Asia Minor to Afghanistan, and from south to Egypt. Alexander the Great in 330 BC overthrown The Achaemenid Empire and his followers initiated The Seleucid Greek Dynasty in Iran.
We witness about dozen successive dynasties reigning over the country after the Seleucids, Dynasties such as Parthian, Sassanid, Samanid, Ghaznavid, Safavid, Zand, Afsharid, Qajar and Pahlavi. In 641 Arabs conquered Iran and began a new era. Persians, who were the followers of Zoroaster, gradually turned to Islam and in Safavid period Islam became the official religion of Iran.
As a result of rulers ineptitude, Iran intensely begins to decline and gets smaller and smaller since Qajar dynasty. The growing vice of the Qajar monarchy led to a constitutional revolution in 1905-1906. The constitutional Revolution marked the end of the medieval period in Iran, but the constitution remained a dead letter. IRAN was occupied by Russian, British, and Ottoman troops that was a blow from which the government never effectively recovered during World Wars I and II.
the nation, under the leadership of Late Imam Khomeini, peep into revolution and the current Islamic republic of Iran was founded in 1979. In spite of different devastating invasions and occupations by Arabs, Turks, Mongols, British, Russians, and others, the country has always hold its national identity and has developed as a distinct political and cultural entity throughout IRAN’s long history.