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Song, known as Liu Song (Chinese: 劉宋), Former Song (前宋) or Song of (the) Southern dynasties (南朝宋) in historiography, was an imperial dynasty of China and the first of the four Southern dynasties during the Northern and Southern dynasties period. It succeeded the Eastern Jin dynasty and preceded the Southern Qi dynasty.
The dynasty was founded by Liu Yu (Emperor Wu; 363–422 AD), whose surname together with "Song" forms the common name for the dynasty, the "Liu Song". This appellation is used to distinguish it from a later dynasty of the same name, the Song dynasty (960–1279 AD, ruled by the House of Zhao). Although the Liu Song has also at times been referred to as the "Southern Song", the name is now mainly used to refer to the Song dynasty after 1127 AD.
The Liu Song dynasty was a time of much internal turmoil. A number of emperors were incompetent and/or tyrannical, and were met with military revolts. These rulers include Liu Shao, Emperor Xiaowu, Liu Ziye, Emperor Ming, and Liu Yu. Emperor Ming was especially cruel, murdering many of his brothers, nephews, and other male relatives — many of them children. Such internal instability eventually led to the dynasty's destruction. However, its founder Emperor Wu was considered one of the greatest generals during the Northern and Southern dynasties period, and the reign of its third emperor, Emperor Wen, is known for its political stability and capable administration, not only of its emperor but its strong and honest officials. This is known as the Reign of Yuanjia (425–453 AD) and one of the relative golden ages for the Southern Dynasties.
Following the death of the Later Qin Emperor Yao Xin, Liu Yu attacked the state of Later Qin, which controlled the valuable lands of Guanzhong, lands which had once housed the capital of the Qin, Han and Jin dynasties before the barbarian uprisings. After defeating the Later Qin army in several battles, as well as an army of Northern Wei troops which had crossed to assist the Later Qin, Liu Yu recaptured the vital cities of Chang'an and Luoyang, the former capitals of the Jin Empire. It is recorded that he engaged the Wei army by the use of spears launched by crossbows, panicking the Wei cavalry and allowing him to score a decisive victory.
After this success, it seemed that Jin would exterminate the remaining barbarian states in the north and reunify China. However, fortunes began to change for the Jin forces. Liu Mengzhi died and in order to secure his power, Liu Yu left for Jiankang (present-day Nanjing), abandoning the management of the North to his general Wang Zhen'e. After his departure, the state of Xia attacked Guanzhong and reoccupied it, and the loss of these lands prescribed Jin's frontier at the Yellow River. However, Jin retained its former eastern capital, Luoyang, as well as most of the Chinese heartland.
In 419, following his return to Jiankang, Liu Yu had Emperor An of Jin strangled and replaced by his brother Sima Dewen, posthumously known as Emperor Gong. Finally, in 420, Sima Dewen abdicated in favour of Liu Yu, who declared himself the ruler of the new Song dynasty. The name of the dynasty was taken from Liu's fief, which occupied roughly the same territory as the Spring & 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.
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General info from Wikipedia.org