Xuanzong was the seventh emperor of the Tang Dynasty in China, ruling from 712 to 756 AD. He is known for his long reign, which is often considered a high point in Chinese history, marked by cultural flourishing and economic prosperity. His era saw advancements in art, music, and literature, with the establishment of the Daoist religion as a significant influence. During his reign, Xuanzong implemented various reforms to strengthen the central government and improve the economy. However, his later years were marred by the An Lushan Rebellion, which significantly weakened the dynasty and led to widespread chaos. Despite this, his contributions to Chinese culture remain influential.