The "Book of Han" is a historical text that covers the history of the Han Dynasty in China, spanning from 206 BCE to 220 CE. Compiled by the historian Ban Gu and his sister Ban Zhao, it is part of the larger "Twenty-Four Histories" and serves as a crucial source for understanding early Chinese history, politics, and culture. This work is divided into several sections, including annals, treatises, and biographies. It details the reigns of various emperors, significant events, and notable figures, providing insights into the social and economic conditions of the time. The "Book of Han" remains an essential reference for historians studying ancient China.