Decline & Fall of Tang. It never again met its own former standard of excellence except in individual emperors such as Xianzong and Xuanzong II as one can see, the Tang Dynasty continued to hold on to power after 763 CE but.

Even though Taizong, Wu Zetian, therefore the Xuanzong that is first had policies which any ruler could keep, their reigns had been effective for their specific personalities ...

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