Sima Yan Unifies the Three Kingdoms

After the Three Kingdoms story ended, the realm did not become quiet at once.

A new unified dynasty began in the hands of the Sima family. When Sima Yan took the throne, he also opened the first long crack that would lead into the age of Wei Jin and the Southern and Northern Dynasties.

This period can look crowded: northern and southern regimes replace one another, royal princes, ministers, military governors, and non-Han leaders keep entering the stage. At the same time, figures such as Wang Xizhi, Tao Yuanming, Xie Lingyun, and Xie Tiao would turn a violent age into another kind of landscape.

So this season begins with the founding of Jin. Sima Yan is not the whole answer to the period, but he is the first key joint in the chain.

The Sima Family Takes the Throne

To understand the Jin and the later north-south division, we have to begin with the Sima family.

Sima Yi had seized Cao Wei's military and political center through the Gaopingling coup. From that point on, each Sima step forward carried blood with it. Sima Shi killed major ministers and deposed the emperor Cao Fang. Sima Zhao went further, killing Cao Mao and installing Cao Huan.

By the time power reached Sima Zhao's son, Sima Yan, the family no longer wanted to rule from behind a Cao emperor.

In February 266, Sima Yan forced Cao Huan to abdicate. He took the imperial title and founded Jin, later known as Western Jin. Cao Huan was made Prince of Chenliu and sent away from Luoyang. He could not return to the capital without permission.

The Sima family had finally reached the top of power.

Now Sima Yan had to answer a harder question: how could the dynasty keep what it had taken?

The First Step Toward Royal Enfeoffment

Sima Yan looked back at Cao Wei and saw a clear lesson.

Wei had tightly restricted its imperial relatives. Cao princes had titles, but little military power. They had only small guards around them, could not freely leave their fiefs, and were often moved from place to place so they could not build deep local bases.

This limited royal rivalry. But when an outside minister's family seized power, the Cao relatives could not rescue the throne. The Sima family had taken Wei precisely through that weakness.

Sima Yan did not want his descendants to repeat Cao Wei's mistake. After becoming emperor, he followed the older model associated with Liu Bang and granted kingdoms to many Sima relatives. At first he appointed twenty-seven kings. Later the number rose to fifty-seven.

These kings were not only decorative nobles. Some held territories as princely states and had considerable authority. Sima Yan also placed several royal princes in command of troops at strategic points such as Xuchang, Ye, and Chang'an, so they could guard Luoyang from the outside.

In Sima Yan's design, if an outsider tried to seize power, Sima princes could rise from different directions and rescue the court.

It looked like protection for the throne. But Sima Yan did not see the other edge of the arrangement. Once the center weakened, armed royal princes would be the first people able to tear Western Jin apart.

Land Policy and Taikang Prosperity

After building royal support, Sima Yan also had to deal with the economic damage left by decades of war.

Many common people had lost land. Powerful families, nobles, and officials had taken large estates. Even an ordinary-looking general might hold wide stretches of farmland. When land was unequal, taxes were harder to collect, and people could not settle into stable life.

Sima Yan promoted a household and tax system in which the zhantian, or land-claiming policy, was especially important. In simple terms, it allowed people to legally hold a certain amount of land according to age, gender, and household status. If people had land, they could live. If they could live, the state could tax them.

The early Western Jin therefore saw a period of relative recovery, later remembered as the Taikang prosperity.

This is one reason Sima Yan is complicated. He was not unable to govern. Before and shortly after reunification, he could see institutional problems, introduce policies, and even encourage thrift.

One famous story says that an imperial physician once offered him a rare pheasant-head fur robe, a luxury garment woven with precious feathers. Ministers expected the emperor to enjoy it. Instead, Sima Yan ordered it burned and warned that anyone who presented such extravagant clothing again would be punished.

At that moment, he still looked like a founding emperor willing to restrain court taste.

The contrast came later. In his early years he could see danger and suppress luxury. After reunification was complete, his restraint slowly loosened.

Eastern Wu Nears the End

While Western Jin was recovering, Eastern Wu in the south was declining.

Wu's final emperor, Sun Hao, became notorious for cruelty. Historical accounts describe harsh punishments, unpredictable killings, flaying, eye-gouging, and mutilation as ways he frightened officials and subjects.

That kind of court lost loyalty from inside while facing a stronger state from outside.

In November 279, Jin launched the conquest of Wu. Jin armies advanced by land and river toward Jianye, Wu's capital.

A few months later, Wu was destroyed. China, divided for decades, was reunited.

From the Yellow Turban Rebellion to Jin's conquest of Wu, nearly a century had passed in upheaval. To people at the time, Sima Yan's achievement could genuinely look like the end of a long age of disorder.

The Tang poet Liu Yuxi later recalled this campaign in "Thoughts of the Past at Xisai Mountain," writing of Wang Jun's tower ships coming down from Yizhou and the royal aura of Jinling fading away.

But Western Jin's unification was not the same as Qin's unification. Qin had risen from a relatively western position through long reforms and conquest. Western Jin inherited Cao Wei's northern foundation, already the stronger economic and military base. Against Wu, Jin won with overwhelming advantages.

From Founding Emperor to the Goat Carriage

After reunification, Sima Yan stood at the height of his life.

That was also when his other side became more visible. After Wu fell, many women from the Wu palace were sent to Luoyang. Sima Yan selected thousands of them for his own palace and sank deeper into pleasure, paying less attention to government.

There were so many palace women that he did not know where to spend the night. So, according to the famous story, he had himself carried in a carriage drawn by goats. Wherever the goats stopped, he stayed.

Palace women began placing bamboo leaves or salt outside their doors to attract the goats. Over time, bamboo leaves and salt appeared everywhere in the palace, and the price of bamboo and salt in Luoyang was said to rise.

The story is absurd, but that is the point. Sima Yan's late energy had moved farther and farther from state affairs.

Shi Chong and Wang Kai Compete in Luxury

When the emperor indulged luxury, court culture followed.

Western Jin ministers and aristocrats competed in display. Extravagance became respectable, and thrift began to look shabby. The most famous example is the rivalry between Shi Chong and Wang Kai.

Wang Kai was Emperor Wu's uncle and an important noble. Shi Chong had served as inspector of Jingzhou and became extremely rich by squeezing merchants and envoys who passed through his region. Later he built the Golden Valley Garden near Luoyang and lived in spectacular luxury.

When Shi Chong heard that Wang Kai washed cooking pots with sugar water, he answered by burning candles as firewood. Wang Kai then built a forty-li purple silk screen outside his home. Shi Chong replied with a fifty-li screen made from even richer colored fabric.

Wang Kai finally asked Sima Yan for help. The emperor gave him a coral tree more than two feet high so he could surpass Shi Chong.

At a banquet, Wang Kai displayed the coral tree. Shi Chong looked at it, picked up an iron ruyi scepter, and smashed it. Everyone was stunned, and Wang Kai was furious.

Shi Chong calmly said he could replace it. Soon he had several taller and finer coral trees brought out. Wang Kai had to concede.

Someone reported to Sima Yan that Shi Chong's extravagance was dangerous, especially because he had destroyed an imperial gift. Sima Yan did not seriously punish him.

The emperor who had once burned the pheasant-head robe no longer seemed willing to suppress luxury.

Cracks After Taikang

By Sima Yan's final years, the hidden side of his earlier choices had begun to show.

He founded Jin, reunited the Three Kingdoms, introduced policy, and gave the state a short recovery. At the same time, he empowered royal princes, tolerated court luxury, and neglected government in his later years. Those risks were left to the next generation.

In 290, Emperor Wu of Jin, Sima Yan, died.

The throne passed to Crown Prince Sima Zhong, later Emperor Hui of Jin.

A dynasty already carrying the dangers of royal princes, empress families, and court indulgence now passed into the hands of an emperor who could not truly control politics.

Western Jin's greater disorder was about to begin.