송서
Following his return to Jiankang, Liu Yu ended the rule of the Jin and became emperor himself in 420, establishing the Liu Song dynasty. The name of the dynasty was taken from Liu's fief, which occupied roughly the same territory as the Spring &amp; Autumn era State of Song. The Book of Song does not mention whether the Liu family had any blood relationship to the ancient state's ruling House of Zi, or by extension to the Shang dynasty. It is in any case noteworthy that Liu did not frame his new regime as a restoration of the Han dynasty, despite being demonstrably related to the Han imperial family. Liu died in 422 CE, and was succeeded by the incompetent Shaodi, who was quickly removed. His eventual successor would be his third son, Wendi.