In Persia, many empires were established, prospered and declined in history. Achaemenid Empire, also known as Persian "First Empire". In 559 BC, Cyrus II unified the ancient Persian tribes and established the Achemani dynasty. Cyrus II defeated the kingdom of Medea, which ruled Persia at that time, 550 years ago, making Persia a powerful empire. In 539 BC, Cyrus II occupied Babylon. In the era of Cambyses Ⅱ, it conquered the post-dynasty of ancient Egypt in the first 525 years. In Darius I, the imperial territory developed unprecedentedly. In May19, Darius invaded the Indus Plain in the east and the Danube Delta, Thrace, Macedonia and Greece in the west, but he failed because of the marathon (the first 490 years). His son Xerxes I later fought against the Greeks again (480 BC), but unfortunately he didn't finish all the work in the end. Achaemenid Empire was the largest empire in the world at that time. [Editor] During the Hellenistic period (330 BC-BC 14 1 year/BC 129), the army of Alexander III of Macedonia defeated Darius Iii in 334 BC-330 BC, and Persia became a part of the Macedonian empire. Alexander's empire soon fell apart. After the war of successors, General Alexander Seleucia I finally became independent from the Seleucia Empire in 3 12, and ruled the Persian region centered on Seleucia and Antioch. During this period, Persia became the hub of communication between the East and the West: the Silk Road thus connected Central Asia with India, Buddhism spread from the Peacock Dynasty in India, and Zoroastrianism influenced Judaism westward. In the late Seleucid Empire, after the independence of Pattaya and Daxia (Bactria, now northern Afghanistan) in the east 247 years ago, the east was disturbed by Daxia and rested in the Western Expedition of the Empire. /kloc-After 0/90 years ago, the western region faced the conquest of the Roman Republic, and eventually lost a large area of Iranian plateau and Mesopotamia during the Arshak dynasty Mitridati I, and was completely destroyed by the Roman Republic in the first 63 years.