Learning the Four Histories refers to Historical Records, Hanshu, Houhanshu and the History of the Three Kingdoms, which belong to the first four of the twenty-four histories. Historical Records is the first book in the history of China, with a total of 130, which is divided into five forms: biography, book, table, aristocratic family and biography. A biography, mainly about princes. The author is Sima Qian of the Western Han Dynasty. Han Shu, also known as Pre-Han Shu, was compiled by Ban Gu, a historian of the Eastern Han Dynasty. It is the first biographical dynastic history in China, and it is also one of the "twenty-four histories". Hanshu is another important historical book in ancient China after Shiji, and it is called "the first four histories" together with Shiji, Houhanshu and The History of the Three Kingdoms. The Book of the Later Han Dynasty is a biographical history book that records the history of the Eastern Han Dynasty. It is called "Four Histories" together with Historical Records, Hanshu and The History of the Three Kingdoms. The book is divided into ten chapters, eighty biographies and eight records (continued by Sima Biao), which records the history from Wang Mang to Emperor Xian of Han Dynasty 195. The History of the Three Kingdoms, written by Chen Shou in the Western Jin Dynasty, mainly records the biographical national history of Wei, Shu and Wu, and records in detail the history of 60 years from the first year (220) to the first year (280) of Emperor Wu of Jin Dynasty, which is praised by later generations.