Bactria
Bronze Age

The Bactria–Margiana Archaeological Complex (BMAC, also known as the "Oxus civilization") is the modern archaeological designation for a Bronze Age archaeological culture of Central Asia, dated to c. 2200 –1700 BC, located in present-day eastern Turkmenistan, northern Afghanistan, southern Uzbekistan and western Tajikistan, centred on the upper Amu Darya (known to the ancient Greeks as the Oxus River), an area covering ancient Bactria. Its sites were discovered and named by the Soviet archaeologist Viktor Sarianidi (1976). Bactria was the Greek name for Old Persian Bāxtriš (from native * Bāxçiš) (named for its capital Bactra, modern Balkh), in what is now northern Afghanistan, and Margiana was the Greek name for the Persian satrapy of Margu, the capital of which was Merv, in today's Turkmenistan.

The early Greek historian Ctesias, c. 400 BC (followed by Diodorus Siculus), alleged that the legendary Assyrian king Ninus had defeated a Bactrian king named Oxyartes in c. 2140 BC, or some 1000 years before the Trojan War. Since the decipherment of cuneiform script in the 19th century, however, which enabled actual Assyrian records to be read, historians have ascribed little value to the Greek account.

According to some writers, Bactria was the homeland (Airyanem Vaejah) of Indo-Iranians who moved south-west into Iran and the north-west of the South Asian subcontinent around 2500–2000 BC. Later, it became the northern province of the Achaemenid Empire in Central Asia. It was in these regions, where the fertile soil of the mountainous country is surrounded by the Turan Depression, that the prophet Zoroaster was said to have been born and gained his first adherents. Avestan, the language of the oldest portions of the Zoroastrian Avesta, was one of the Old Iranian languages, and is the oldest attested member of the Eastern Iranian languages.
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