In the course of Vietnamese history going from the monarchy to the modern, perhaps Phan Thanh Gian is one of the most controversial figures. Virtually all debate has not been able to come to an end. At every stage, almost every voice that impeaches him will appear words, gestures of advocacy, and vice versa ... This loop continues seemingly endless, from the Tu Duc period (1880s) to the present day (mentioned in "Part Two" and "Part Three-A" of this book). Through this work, the authors want to contribute more documents to posterity to have more data and bases to consider the most controversial period in Phan Thanh Gian's life - a Nguyen dynasty mandarin who was intimately related to the context of the times extremely important in Vietnamese history.