550 B.C. Cyrus defeated the Medes at Pasargad, founded the dynasty and broadened the empire.
522 - 486 B.C. Darius I, the great, suppressed rebels, established the first civil society in Iran and broadened the Empire. He ordered the construction of Persepolis.
330 B.C. Alexander invaded Persia, destroyed the uncompleted Persepolis and took the Persian Empire.
323 B.C. Death of Alexander