This book blends historical fact and literature, tracing the rise and fall of Emperor Xuanzong of Tang in measured, meticulous prose. During the first part of his reign, Xuanzong was ambitious and far-sighted. He appointed capable and virtuous officials and ushered in the Kaiyuan Prosperity, bringing Tang power to its peak. In his later years, however, he gave himself over to pleasure, failed to distinguish loyal officials from traitors, and neglected state affairs, triggering the An Lushan Rebellion. War ravaged the land, bringing misery to the people of the Tang and dealing a devastating blow to the empire's strength. The dynasty went from prosperity to decline. In his old age, Xuanzong was confined to Gantang Palace, and even his trusted aide Gao Lishi was demoted. He spent his final days in desolation and solitude. His life serves as a warning to those who come after: even with the might of the prosperous Tang and an emperor as brilliant as Xuanzong, abandoning one's original aspirations, failing to strive for progress, and indulging in pleasure can lead only to decline, even the fall of a nation, until all its splendor is reduced to nothing.