From Qin Shihuang's unification of the six countries and the establishment of the first feudal dynasty in history to the abdication of the last emperor Puyi, in the long history of more than 2,000 years, there were as many as 100 feudal dynasties, but there was only one dynasty that lasted for more than 300 years, and that was the Dasong Dynasty established by Zhao Kuangyin.

From the mutiny of Song Taizu, Zhao Kuangyin and Chen Qiao in 960 to the naval battle of Yashan in the Song and Yuan Dynasties, the emperor at the end of the Song Dynasty jumped into the sea and died, totaling 18 emperor, which lasted for 3 19 years.

Although today's Song Dynasty is divided into the Northern Song Dynasty and the Southern Song Dynasty, there are no so-called two Song Dynasties in history. The only historical book that records the history of the Song Dynasty is The History of the Song Dynasty. The legal capitals of the Southern Song Dynasty are still Kaifeng, Tokyo and Lin 'an, that is, Hangzhou, which is just a trip. What is travel? It is also the place where emperors travel.

Some people may say that after Qin Hui was kidnapped, Zhang Bangchang was the "puppet emperor". The problem is that Zhang Bangchang has only been in office for more than two months. At that time, the Empress Dowager Meng was in charge, and everyone in the world belonged to the Zhao and Song royal families.

In other words, after Qin Hui was kidnapped, it was normal for the country to be leaderless, but only a few days later, Zhao Gou proclaimed himself emperor in Nanking, which was called Song Gaozong in history. Emperor Gaozong refers to the emperor who obeyed orders. We can know from posthumous title that later generations regarded him as the emperor of Zhongxing and Song Dynasty. In addition, Song Gaozong Zhao Gou is Song Huizong's ninth son and Song Qinzong's younger brother. The succession to the throne is clear and indisputable.

On the other hand, the new dynasty between the Han Dynasty, the Western Han Dynasty and the Eastern Han Dynasty lasted 15 years. Liu Xiu, the founding emperor of the Eastern Han Dynasty, is only a descendant of Liu Fa, the emperor of the Western Han Dynasty. Whether it is true or not, because it has long been a remote branch of the royal family, it is like Liu Bei claiming to be a descendant of the Han royal family.

In the eyes of ancient historians, the Western Han Dynasty and the Eastern Han Dynasty were two dynasties. What they have in common is that the founding emperors were all surnamed Liu. The historical books that record the history of the Han Dynasty are Hanshu and Houhanshu respectively, and the Western Han Dynasty and the Eastern Han Dynasty are also called Qianhan and Houhan.

Therefore, the longest feudal dynasty in history is the Dasong Dynasty established by Zhao Kuangyin, which enjoyed the country for 3 19 years, ranking first among feudal dynasties.