The Chagatai language reference article from the English Wikipedia on 24-Jul-2004
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Chagatai language

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The Chagatai language is an extinct Turkic language spoken in Central Asia.

It was developed as a sophisticated written language using the Arabic alphabet. It was heavily influenced by Arabic and Persian. It served as a lingua franca in Central Asia.

The USSR replaced the Chagatai language with discrete languages based on the vernaculars to separate Turkic peoples.

Famous Chagatai literature: Baburnama