The First inhabitants of Iran were a race of people living in western Asia. When the Aryans arrived, they gradually started mingling with the old native Asians. Aryans were a branch of the people today known as the Indo-Europeans, and are believed to be the ancestors of the people of present India, Iran, and most of Western Europe.
Recent discoveries indicate that centuries before the rise of the earliest civilizations in Mesopotamia, Iran was inhabited by humans. But the written history of Iran dates back to 3200 BC. It begins with the early Achaemenid, The dynasty whose under the first Iranian world empire blossomed.
Cyrus the Great was the founder of the empire and he is the first to establish the charter of human rights. In this period Iran stretched from the Aegean coast of Asia Minor to Afghanistan, as well as south to Egypt. The Achaemenid Empire was overthrown by Alexander the Great in 330 BC and was followed by The Seleucid Greek Dynasty.
After the Seleucids, we witness about dozen successive dynasties reigning over the country, Dynasties such as Parthian, Sassanid, Samanid, Ghaznavid, Safavid, Zand, Afsharid, Qajar and Pahlavi. In 641 Arabs conquered Iran and launched a new vicissitudinous era. Persians, who were the followers of Zoroaster, gradually turned to Islam and it was in the Safavid period when Shiite Islam became the official religion of Iran.
Since the Qajar dynasty on, due to the inefficiency of the rulers, Iran intensely begins to decline and gets smaller and smaller. The growing corruption 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. During World Wars I and II the occupation of Iran by Russian, British, and Ottoman troops was a blow from which the government never effectively recovered.
In 1979, the nation, under the leadership of Late Imam Khomeini, erupted into revolution and the current Islamic Republic of Iran was founded. Throughout IRAN’s long history, despite different devastating invasions and occupations by Arabs, Turks, Mongols, British, Russians, and others, the country has always maintained its national identity and has developed as a distinct political and cultural entity.