Liu (April 363-June 422), Emperor Gaozu of the Song Dynasty, was born in March of the first year of Xingning. My ancestors were from Pengcheng (now Xuzhou City, Jiangsu Province). Later, his family moved to Jingkou (now Zhenjiang City, Jiangsu Province), where Liu Yu was born today. According to The Book of Song Dynasty: The Biography of Emperor Wu of Han Dynasty, Emperor Wu of Han Dynasty was the twenty-first grandson of Liu Jiao, the younger brother of Liu Bang and the younger brother of Emperor Gaozu. The founder of the Song Dynasty in the Southern and Northern Dynasties was called Song Wudi. An outstanding politician, strategist and commander-in-chief in the history of China. Longan three years (399), joined the army uprising. In 4 13, Emperor Long 'an destroyed Qiao Zong in Yizhou. Internally, the south defeated Lu Xun and recovered Guangzhou; Conquer Jiangling and kill separatist Liu Yi; Take Chengdu and destroy Qiao Zong; Go straight to Xiangyang and drive away the separatist Sima Xiuzhi. In the 13th year (4 17), after the demise of the Qin Dynasty, on July 10, 420 (June 14th, the first year of yongchu, Song Wudi), Emperor Wu of Song abolished Sima of the Eastern Jin Dynasty, became emperor on his own, and the Southern Dynasties began. A series of reform measures implemented before and after he proclaimed himself emperor further dealt a blow to the decadent and dark aristocratic and gentry forces, improved the political and social situation, laid a solid foundation for Yuanjia's rule and laid the embryonic form of politics in the Southern Dynasties. Li Zhi, a great thinker in the Ming Dynasty, praised him as "the king who set aside chaos to promote prosperity".