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Duke Kang of Qin

Duke Kang of Qin (Chinese: 秦康公; pinyin: Qín Kāng Gōng, died 609 BC) was from 620 to 609 BC the fifteenth ruler of the zhou dynasty state of Qin that eventually united China to become the qin dynasty. His ancestral name was Ying (嬴), personal name Ying (罃), and Duke Kang was his posthumous title.

Succession crisis of Jin

Duke Kang was one of the 40 sons of his father Duke Mu of Qin, and succeeded Duke Mu as ruler of Qin when he died in 621 BC. In the same year Duke Xiang of Jin also died, starting a succession crisis in Qin's neighbouring state Jin. Zhao Dun, the powerful minister of Jin, initially wanted to install Duke Xiang's younger brother Prince Yong on the Jin throne. Prince Yong was at the time exiled in Qin, and in 620 BC Qin sent an army to escort Yong back to Jin. However, Zhao Dun soon changed his mind and instead made Duke Xiang's young son Yigao the ruler, later known as Duke Ling of Jin. Jin then dispatched an army to stop Prince Yong, and defeated the Qin escort force at Linghu.

Conflicts with Jin

The Jin succession dispute began a series of conflicts between Qin and Jin. A year after the battle at Linghu, Qin invaded Jin and took the city of Wucheng (武城, in present-day Hua County, Shaanxi ) in revenge. Two years later, in 617 BC Jin attacked Qin in return, taking Shaoliang (少梁, in present-day Hancheng, Shaanxi ). Then in 615 BC Qin counterattacked again, taking Jima (羈馬). Jin dispatched an army to repel Qin, and the two forces met at nearby Hequ (河曲, present-day Fenglingdu, Ruicheng County), but both retreated without engaging in battle.