Kāi yuán
Tang emperor Xuanzong's 唐玄宗[Tang2 Xuan2 zong1] reign name used during the Kaiyuan era (713-741), a peak of Tang prosperity
Kāi yuán shèng shì
peak of Tang prosperity during Kaiyuan, reign name 713-741 of Tang emperor Xuanzong 唐玄宗[Táng Xuán zōng]
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