The Tocharians or Tokharians (US: toh-KAIR-ee-ən, -⁠KAR-; UK: to-KAR-ee-ən) were speakers of the Tocharian languages, Indo-European languages known from around 7,600 documents from around AD 400 to 1200, found on the northern edge of the Tarim Basin (modern-day Xinjiang, China). The name "Tocharian" was given to these languages in the early 20th century by scholars who identified their speakers with a people known in ancient Greek sources as the Tókharoi (Latin: Tochari), who inhabited Bactria from the 2nd century BC. This identification is now generally considered erroneous, but the name "Tocharian" remains the most common term for the languages and their speakers. Their actual ethnic name is unknown, although they may have referred to themselves as the Agni, Kuči, and Krorän or as the Agniya and Kuchiya known from Sanskrit texts.
Agricultural communities first appeared in the oases of the northern Tarim circa 2000 BC. Some scholars have linked these communities to the Afanasievo culture found earlier (c. 3500–2500 BC) in Siberia, north of the Tarim or Central Asian BMAC culture. The earliest Tarim mummies date from c. 1800 BC, but it is unclear whether they are connected to the Tocharians of two millennia later.
By the 2nd century BC, these settlements had developed into city-states, overshadowed by nomadic peoples to the north and Chinese empires to the east. These cities, the largest of which was Kucha, also served as way stations on the branch of the Silk Road that ran along the northern edge of the Taklamakan Desert.
For several centuries, the Tarim basin was ruled by the Xiongnu, the Han dynasty, the Tibetan Empire, and the Tang dynasty. From the 8th century AD, the Uyghurs – speakers of a Turkic language – settled in the region and founded the Kingdom of Qocho that ruled the Tarim Basin. The peoples of the Tarim city-states intermixed with the Uyghurs, whose Old Uyghur language spread through the region. The Tocharian languages are believed to have become extinct during the 9th century.

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