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What happened to the eastern Turks who surrendered to Tang China?

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Taizong The Taizong emperor, detail of a portrait; in the National Palace Museum, Taipei.

Following the total defeat of the eastern Turks in 630, the Tang emperor Taizong implemented a policy of integration and strategic utilization for the surrendered population.

A large number of these Turks were settled along the Chinese frontier, effectively bringing them under Tang control while utilizing their military expertise. Many of the surrendered Turks were incorporated into the Tang armies, serving as soldiers for the empire. This approach allowed Taizong to secure his borders and maintain stability in the region after being recognized as the "heavenly khan" by the defeated Turkish leadership.21