This book is translated from the original Chinese manuscript among the documents on Vietnamese history currently stored in the library of Yale University, USA. This is a chronicle history book, recording the period of peasant rebellions and decentralized dynasties established between the end of the figurehead Le dynasty in 1770 and the beginning of the Nguyen dynasty in 1802. According to the name of most historians, especially modern historians in Vietnam, the "Tay Son" was used to call the reigns of the brothers Nguyen Nhac, Nguyen Lu and Nguyen Hue to distinguish them from the later Nguyen Dynasty founded by Nguyen Anh. One of the greatest achievements of the Tay Son family in the nation's history has been very close to the reunification and expansion of the country's territory after hundreds of years Vietnam was divided by the power struggles between the great forces Mac - Trinh - Nguyen.