One of the Marquess of Shen's daughters was married to King You as his queen, and gave birth to Crown Prince Yijiu, but another consort named Bao Si gained the favor of the king, who wanted to depose Queen Shen and Crown Prince Yijiu in favor of Bao Si's son Bofu.
Furious, the Marquess of Shen allied with the Zeng state and Quanrong barbarians to attack the Zhou capital Haojing in 771 BCE.
King You was defeated and killed at the foot of Mount Li (near modern-day Xi'an), and the capital Haojing was sacked by Quanrong.
[3] During the early reign of King Ping, the Marquess of Shen dominated the politics of the Zhou court with his grandson as the puppet ruler.
This led to his political enemies, especially the Duke of Western Guo, to instate a rival king, who remained in opposition until 750 BCE.