Introduction to Qiaoling: Qiaoling, also known as Qiaozhong, is the tomb of Li Dan, Emperor Ruizong of the Tang Dynasty. It was built in the prosperous period of Kaiyuan. Tang Ruizong Li Dan was the fifth emperor of the Tang Dynasty. He was the eighth son of Gaozong Li Zhi, the fourth son of Empress Wu Zetian, and the father of Tang Xuanzong Li Longji. Li Dan ascended the throne of emperor twice, but his time was short and he achieved little.