Digunai (24 February 1122 – 15 December 1161), also known by his sinicised name Wanyan Liang (完顏亮) and his formal title Prince of Hailing (海陵王, Hǎilíng Wáng), was the fourth emperor of the Jurchen-led Jin dynasty of China. He was the second son of Wanyan Zonggan, the eldest son of Aguda (Emperor Taizu) (the founder of the Jin dynasty). He came to power in 1150 after overthrowing and murdering his predecessor, Emperor Xizong, in a coup d'état. During his reign, he moved the Jin capital from Shangjing (present-day Acheng District, Harbin, Heilongjiang Province) to Yanjing (present-day Beijing), and introduced a policy of sinicisation. In 1161, after the Jin dynasty lost the Battle of Caishi against the Southern Song dynasty, Digunai's subordinates rebelled against him and assassinated him. After his death, even though he ruled as an emperor during his lifetime, he was posthumously demoted to the status of a prince – "Prince Yang of Hailing" (海陵煬王) – in 1162 by his successor, Emperor Shizong. However, in 1181, Emperor Shizong further posthumously demoted him to the status of a commoner, hence he is also known as the "Commoner of Hailing" (海陵庶人). Background Digunai was the second son of Woben (斡本; also known as Wanyan Zonggan 完顏宗幹), a son of Aguda (Emperor Taizu), the founder of the Jin dynasty. His mother was, Lady Da, came from an elite family of Balhae descent. Emperor Taizu's brother and successor, Emperor Taizong, started a series of wars between the Jin and Song dynasties. During the reign of Emperor Xizong, who succeeded Emperor Taizong, Wanyan Zonggan was described as the most influential man in the Jin imperial court. Digunai, who was an army marshal under Emperor Xizong, overthrew the emperor in a coup d'état in 1150 and replaced him. Having seized the throne through illegitimate means, Digunai was suspicious of other members of the Jurchen aristocracy, and, immediately upon taking the throne, started eliminating potential rivals. He ordered the massacre of the descendants of Emperor Taizong, so as to secure the position of the lineage of Emperor Taizu, to which he belonged. Reign Digunai capitalised on the Jin dynasty's "superior status" vis-à-vis the Song dynasty after its victory over the latter in 1141, and sought to make the Jin dynasty the sole Chinese empire. To legitimise himself as a sinicised ruler, in 1150 he lifted Emperor Taizong's prohibition of wearing Han Chinese dress, and adopted an