Life In Iran

Other tribes began to settle on the eastern edge, as far as on the mountainous frontier of the north-western Indian subcontinent and into the area which is now Balochistan. Others, such as the Scythian tribes, spread as far west as the Balkans and as far east as Xinjiang. Avestan is an eastern Old Iranian language that was used to compose the sacred hymns and canon of the Zoroastrian Gathas in c. 1000 BC.
• Pre-Islamic statehood (625 BC – 651 AD)
The Medes are credited with the unification of Iran as a nation and empire (625–559 BC), the largest of its day, until Cyrus the Great established a unified empire of the Medes and Persians leading to the Achaemenid Empire (559–330 BC), and further unification between peoples and cultures. After Cyrus' death, his son Cambyses II continued his father's work of conquest, making significant gains in Egypt.
Following a power struggle after Cambyses' death, Darius the Great was declared king (ruled 522–486 BC). Under Cyrus and Darius, the Persian Empire eventually became the largest and most powerful empire in human history up until that point. The borders of the Persian empire stretched from the Indus and Oxus Rivers in the east to the Mediterranean Sea in the west, extending through Anatolia (modern day Turkey) and Egypt.