Tang 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 the arts, particularly in poetry and music, with notable figures like the poet Li Bai emerging during this time. Under Tang Xuanzong's leadership, the empire expanded its territory and strengthened its military. However, his later years were marred by political strife and the devastating An Lushan Rebellion, which significantly weakened the dynasty. Despite these challenges, his reign remains a symbol of the cultural achievements of the Tang Dynasty.