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Ancient Iran is called Persia. The first empire of Persia was found by Cyrus the great. This first empire of Persia was also called the Achaemaenid empire. This empire was found by Cyrus in nearly 550 B.C.  Cyrus was leader of a Persian tribe. He started to defeat kings of his reign. He defeated the king of Babylon. His empire has boundaries spread from Nile river to Indian Indus river. He was also ruler of world's first superpower. His name was repeated in Hebrew bible for 21 times because of conquering Babylonian empire and exiling Jews. His religion was Zoroastrianism.