In King You of Zhou's reign (r. 781-771 BCE), the Marquess of Shen with support from Quanrong nomads from the west overran Hàojīng heralding the end of the Western Zhou Dynasty.
Haojing |
After an attack by Quanrong nomads allied with several vassal states including Shen and Zheng, the Zhou ruler King You was killed in his palace at Haojing.
In 771 BC, the 45th of his reign, the Quanrong attacked the Zhou capital Haojing and killed both King Xuan of Zhou and Duke Huan of Zheng.
As the national capital Haojing had suffered severe damage, and was located near the potentially dangerous Quanrong, in 771 BC, King Ping of Zhou moved the capital eastward to Luoyang, thus beginning the Eastern Zhou Dynasty and ushering in the Spring and Autumn period which would last for more than 300 years.
When You replaced his wife with a concubine, the former queen's powerful father, the Marquess of Shen, joined forces with Quanrong barbarians to sack the western capital of Haojing and kill King You in 770 BCE.