Late in the Western Zhou, King You removed Queen Shen and the crown prince Yijiu, elevating Bao Si and her son instead—an act that destabilized elite support and helped trigger armed intervention by allied regional powers.
The Marquess of Shen (Shenhou), angered by the deposition of his daughter and grandson, allied with forces from the west commonly identified as Quanrong and moved against the Zhou royal center near Haojing.
Fighting near the Zhou twin-capital zone (Haojing/Feng) culminated in the destruction of the royal seat; traditional accounts link the defeat to the failure of beacon summons after prior false alarms. The event conventionally marks the collapse of the Western Zhou.
In the course of the 771 BCE assault, King You was killed and Bao Si was taken captive, ending the direct authority of the Western Zhou court at Haojing.
Following the 771 BCE catastrophe, the Zhou court abandoned the Fenghao (Feng/Haojing) capital complex in the Wei River valley, reflecting the loss of secure control over the western heartland.
Luoyi (Luoyang) developed as the principal royal residence and symbolic center for the Zhou kings after the relocation, reinforcing the eastward reorientation of interstate diplomacy and ritual hierarchy.
Chinese historiography treats the sack of Haojing (771 BCE) and the move to Luoyi/Chengzhou as the decisive watershed between Western Zhou and Eastern Zhou, anchoring later periodization (including the Spring and Autumn era).
After King You’s death, major regional actors (notably including Shen and other allied lords) recognized the deposed crown prince Yijiu as King Ping, enabling the Zhou royal line to continue in reduced circumstances.
Some transmitted and excavated traditions describe a contested succession in which another Zhou royal (often identified as Yuchen) was elevated at Xie, producing a period with competing royal claimants alongside King Ping.
King Ping’s regime shifted the royal seat east to Chengzhou (also known as Luoyi, in the Luoyang area), a move that conventionally defines the start of the Eastern Zhou and a new political geography centered further east.
With the court now at Luoyi/Chengzhou, the Zhou king’s role increasingly became that of a ritual and diplomatic figurehead as powerful regional states consolidated autonomy—conditions that shaped the subsequent Spring and Autumn political order.
Later sources describe the rival claimant at Xie being eliminated (often dated to mid-8th century BCE), allowing King Ping’s line to stand as the recognized Zhou monarchy even as effective power remained fragmented among states.
Sack of Haojing and the Move to Luoyang (events of 771 BCE and aftermath)
