 | The Oxus treasure is a collection of about 180 pieces of metalwork in gold and silver from the Achaemenid Persian period, found by the Oxus river about 1877-1880 in Takht-i Kuwad, Tadjikistan. It is the most important surviving collection of gold and silver to have survived from the Achaemenid period. (6th-4th century BC) |  |
 | The Achaemenid Dynasty built an empire (559–330 BC) which, at its peak, spanned three continents. In sheer land mass, the Achaemenid Empire was the largest empire the ancient world had ever seen until 331-330 BC, when Alexander the Great toppled the Persian regime on his eastward march from the Mediterranean through Afghanistan to India. |  |
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 | The Achaemenid Empire (c. 550–330 BCE), was an empire in Western and Central Asia, founded in the 6th century BCE by Cyrus the Great. The dynasty draws its name from king Achaemenes, who ruled Persis between 705 BCE and 675 BCE. The empire expanded to eventually rule over much of the ancient world which at around 500 BCE stretched from the Indus Valley in the east, to Thrace and Macedon on the northeastern border of Greece, making it the biggest empire the world had yet seen. The Achaemenid Empire would eventually control Egypt as well. |  |
 Panoramic view of the Naqsh-e Rustam. This site contains the tombs of four Achaemenid kings, including those of Darius I and Xerxes. | In 480 BCE, it is estimated that 50 million people lived in the Achaemenid Empire or about 44% of the world's population at the time, making it by population the largest empire. |
 | Alexander the Great (Alexander III of Macedon) defeated the Persian armies at Granicus (334 BCE), followed by Issus (333 BCE), and lastly at Gaugamela (331 BCE). Afterwards, he marched on Susa and Persepolis which surrendered in early 330 BCE. |  |
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