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The nucleus of the Achaemenid empire (538—331 BC), the kingdom of Persia (principalities of Anshan and Persia), lay to the north and east of the head of the Persian Gulf (Map 12). Three-quarters ot a century ot extraordinary expansion commenced under Cyrus who annexed, first, western Elam (556 BC), then the Median empire (549 BC), Assyria (548-547 BC), Lydia (546 BC) and, finally, the Neo-Babylonian empire (539-8358 BC). Cambyses II added Egypt, Cyrene and Cyprus (525 BC). Darius I (521-486 BC) advanced the eastern frontier from the Oxus and Jaxartes to the Indus (ca. 520 BC), and his son, Xerxes I (486-465 BC), occupied Macedonia and Thessaly. Athens fell in 480 BC. For the first time, all the most ancient centers of civilization in the Old World (except China) were brought under the nominal control of a single power. P.50 ************ Alexander and Porus meet each other near the river Hydaspes. P.52*****************map of iran achaemenid P.45*************