唐玄宗 Tang Xunzong 685 - 762
Emperor Xuanzong of Tang (Chinese: 唐玄宗) (8 September 685 – 3 May 762), also commonly known as Emperor Ming of Tang (Chinese: 唐明皇), personal name Li Longji (Chinese: 李隆基), known as Wu Longji (Chinese: 武隆基) from 690 to 705, was the seventh emperor of the Tang dynasty in China, reigning from 712 to 756. His reign of 43 years was the longest during the Tang Dynasty. In the early half of his reign he was a diligent and astute ruler. Ably assisted by capable chancellors like Yao Chong, Song Jing and Zhang Yue, he was credited with bringing Tang China to a pinnacle of culture and power.
Emperor Xuanzong, however, was blamed for over-trusting Li Linfu, Yang Guozhong and An Lushan during his late reign, with Tang's golden age ending in the Anshi Rebellion. This marked the beginning of the Tang dynasty's decline.