Liu Song dynasty

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 CE), 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 CE, 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 CE.

The Liu Song was a time when there was much internal turmoil. A number of emperors were incompetent and/or tyrannical, which at least partially led to many military revolts. These rulers include Liu Shao, Emperor Xiaowu, Liu Ziye, Emperor Ming, and Liu Yu. Emperor Ming was especially vicious, 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) and one of the relative golden ages for the Southern Dynasties.

Although he was a descendant of Emperor Gaozu of Han's younger brother Liu Jiao, he was still born into poverty. He joined the army at a young age, quickly distinguished himself in the army and was quickly promoted to the command of an army, the Beifu corps. Liu Yu was instrumental in fighting the rebel Huan Xuan. After Huan Xuan's fall, Liu Yu gained control of the Jin dynasty.

Regarded as one of the best generals of the Northern and Southern dynasties, Liu Yu started off by reclaiming much of the territory the Chinese had lost during the Sixteen Kingdoms era. He started off his career by campaigning against Southern Yan, which bordered Jin to the north and had adopted a policy of aggression and kidnapping citizens from the Jin. By spring of 410, he had captured the southern Yan capital at Guanggu, ending Southern Yan.

Afterwards, he campaigned against western Shu in modern Sichuan. Using a brilliant military manoeuver mentioned in the Art of War, Liu Yu instructed his generals to attack the capital of Shu by the Min River rather than the short route by the Fu river. Surprising the Shu forces, he quickly captured Chengdu and re-annexed that area back into Jin.

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.