Enter the Spoiled Heirs#
After the Three Kingdoms were unified under Jin, the Sima family finally ruled all of China.
You’d think the good times had begun. But here’s the thing — wealth rarely survives three generations.
The founding emperor Sima Yan was decent, but his sons and grandsons were worse with each generation. They were experts at squandering the family fortune.
War of the Eight Princes: Family Fighting Family#
After Sima Yan died, his son Sima Zhong became emperor. This Sima Zhong was a “foolish emperor” — when people were starving to death, he asked: “Why don’t they eat meat porridge?”
With such a fool on the throne, real power fell to others. Eight princes of the Sima family thought: “Why should you be in charge? I can do it too!”
So the eight of them fought each other — you hit me, I hit you — for a full 16 years. This was the War of the Eight Princes.
They beat the country to a pulp, and the people were left homeless.
The Five Barbarians Invade: Outsiders Seize the Chance#
While the Sima family fought among themselves, the northern nomadic peoples were thrilled — your infighting is our opportunity!
Five groups — the Xiongnu, Xianbei, Jie, Di, and Qiang — marched south and conquered large parts of the Chinese heartland. This was the Invasion of the Five Barbarians.
The north fell into chaos. Han Chinese were slaughtered and enslaved. It was devastating.
Crossing the Yangtze: Fleeing South#
The north was no longer safe. What to do? Run!
Sima family descendant Sima Rui led nobles and commoners alike south across the Yangtze River, establishing the Eastern Jin Dynasty in Jiankang (today’s Nanjing).
This is called “Crossing the Yangtze in Fine Robes” — the nobles, still in their华丽 clothes, fled across the river to the south.
Battle of Fei River: 80,000 vs. 800,000#
The Eastern Jin was safe in the south, but the northern threat didn’t go away.
Former Qin emperor Fu Jian unified the north and marched south with 800,000 troops, intending to crush Eastern Jin in one blow.
Eastern Jin had only 80,000 soldiers — ten times fewer. But Prime Minister Xie An stayed calm and sent his nephew Xie Xuan to face the enemy.
The two armies faced off across the Fei River. Xie Xuan came up with a clever plan: he asked Fu Jian to pull back a bit, creating space for Eastern Jin to cross the river for a proper battle.
Fu Jian thought: “When they’re halfway across the river, I’ll charge — even better!” So he agreed.
But as soon as the大军 pulled back, their formation broke apart. Eastern Jin seized the moment, crossed the river, and attacked fiercely. Former Qin’s army collapsed.
The fleeing soldiers ran for their lives, hearing wind and crane calls, seeing trees and grass on the mountains — all of them thought they were Eastern Jin pursuers. This is the origin of the idiom “wind and crane calls, every bush an enemy soldier.”
The Fall of Eastern Jin#
The Battle of Fei River saved Eastern Jin, but Eastern Jin wasn’t much better itself.
General Liu Yu had too much功劳 and simply kicked the emperor off the throne, founding the Liu Song Dynasty.
Eastern Jin fell, and China entered the Southern and Northern Dynasties period.
History Wisdom#
The Two Jin Dynasty teaches us two lessons:
First, internal fighting is the stupidest thing. The War of the Eight Princes drained Western Jin’s strength and gave outsiders their chance. Fighting among yourselves only benefits others.
Second, squandering is easy, building is hard. The Sima ancestors spent three generations building their empire. Their descendants destroyed it in just over a decade.
Knowledge Card#
- Key Figure: Sima Yan, 236 – 290, founding emperor of Western Jin
- Key Figure: Fu Jian, 338 – 385, emperor of Former Qin
- Key Figure: Xie An, 320 – 385, Eastern Jin prime minister, commander at Fei River
- Major Event: War of the Eight Princes (291 – 306) — Sima family civil war for 16 years
- Major Event: Invasion of the Five Barbarians — northern peoples invaded the Central Plains
- Major Event: Battle of Fei River (383) — 80,000 defeated 800,000
- Related Idiom: Wind and Crane Calls — fleeing soldiers恐慌 at every sound; means extreme fear
- Related Idiom: Every Bush an Enemy Soldier — seeing enemies everywhere; means being terrified
- Related Idiom: Rising from the East Mountain — Xie An’s comeback after retirement; means making a comeback
- Sources: Book of Jin, Comprehensive Mirror in Aid of Governance