Duke Xian of Jin
Prince Chong'er was born to Duke Xian of Jin in 697 BC. The "Zuo Zhuan" notes that "his ribs were all grown together," a sign of strength and leadership. Chong'er's half-brothers included Shensheng and Xiqi. While Shensheng was the original crown prince, in his later years Duke Xian favoured the concubine Li Ji, who desired her son Xiqi to be heir instead. As such, she plotted to discredit Shensheng before his father, eventually leading to Shensheng's suicide in 656 BC.