The Book of Han is a history of China finished in 111 CE, covering the Western, or Former Han dynasty from the first emperor in 206 BCE to the fall of Wang Mang in 23 CE. The work was composed by Ban Gu, an Eastern Han court official, with the help of his sister Ban Zhao, continuing the work of their father, Ban Biao. They modelled their work on the Records of the Grand Historian, a cross-dynastic general history, but theirs was the first in this annals-biography form to cover a single dynasty. It is the best source, sometimes the only one, for many topics such as literature in this period. The Book of Han is also called the History of the Former Han to distinguish it from the Book of the Later Han which covers the Eastern Han period from 25 to 220 CE, and was composed in the fifth century by Fan Ye.

Wang Mang, courtesy name Jujun, officially known as the Shijianguo Emperor (始建國天帝), was the founder and the only emperor of the short-lived Chinese Xin dynasty. He was originally an official and consort kin of the Han dynasty and later seized the throne in 9 CE. The Han dynasty was restored after his overthrow, and his rule marked the separation between the Western Han dynasty and Eastern Han dynasty. Traditional Chinese historiography viewed Wang as a tyrant and usurper, while more recently, some historians have portrayed him as a visionary and selfless social reformer. During his reign, he abolished slavery and initiated a land redistribution program. Though a learned Confucian scholar who sought to implement the harmonious society he saw in the classics, his efforts ended in chaos.