Tocharian B

Tocharian B, also known as Kuchean or West Tocharian, was a Western member of the Tocharian branch of Indo-European languages, extinct from the ninth century. Once spoken in the Tarim Basin in Central Asia, Tocharian B shows an internal chronological development; three linguistic stages have been detected. The oldest stage is attested only in Kucha. There is also the middle ("classical"), and the late stage.