Tabgach was a central Asian name for China, derived from Tuoba (拓跋), a powerful Xianbei tribe. Also the byname for the Tang Empire in Tangri Bilge's Orhon inscriptions. At that time China was dominated by half-Xianbei and half-Chinese people.
The Turkish khan bashed the Tabgach for being content with sedentary life.
Later, a Kara-Khanid sultan of Kashgari was given the name Tabgach Mahmoud.
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