A Letter of Reply to Ren An was written by Sima Qian, who was historian and writer in Han dynasty, to his friend Ren An. Sima Qian expressed his misfortune in this letter.
Sima Qian (c. 145/135 – c. 86 BC) was a Chinese historian of the early Han dynasty (206 BC – AD 220). He is considered the father of Chinese historiography for his Records of the Grand Historian, a general history of China in the Jizhuanti style covering more than two thousand years beginning from the rise of the legendary Yellow Emperor and the formation of the first Chinese polity to the reigning sovereign of Sima Qian's time, Emperor Wu of Han. As the first universal history of the world as it was known to the ancient Chinese, the Records of the Grand Historian served as a model for official history-writing for subsequent Chinese dynasties and the Chinese cultural sphere (Korea, Vietnam, Japan) up until the 20th century.