The Disaster of Yongjia refers to events that occur in 311 CE, when Wu Hu forces capture and sack Luoyang, the Jin capital.

After this victory, Wu Hu forces commit a massacre when entering the city, killing the Jin crown prince, a host of ministers, and over 30,000 civilians.

They also burn down the palaces and dig up Jin mausoleums.

This is seen as the event that leads to the fall of the Han-majority ruled and unified Jin Dynasty, and its re-establishment as the Eastern Jin Dynasty.