Thach Sanh

He killed a monster. He saved a princess. And he ended up in chains, in a dark prison cell, with nothing left but a lute.

Its music was about to change everything. This is the tale of Thach Sanh — one of the most beloved folktales in Vietnam.

Long ago, at the foot of an ancient banyan tree, there lived an orphan named Thach Sanh. His parents had died when he was small, and he lived alone in a tiny hut, going into the forest every day to cut firewood.

He was poor — but he was no ordinary boy. The story goes that he was a prince of Heaven, sent down to be born on earth, and that the immortals themselves had taught him every martial art and every magic skill.

One day, a wine seller named Ly Thong came down the path. He saw how strong the young woodcutter was, and thought at once: this one could be useful. So he poured him a cup of wine, and asked him to become his sworn brother.

Thach Sanh had never had a family. He gladly agreed, moved in with Ly Thong, and treated him and his old mother as his own flesh and blood.

In that region lived a python demon — a giant snake that had become an evil spirit. Every year, the villagers had to give it one human life. That year, the lot fell to Ly Thong. And Ly Thong came up with a plan.

Little brother, guard the temple for me tonight. I’m busy brewing wine.

Thach Sanh took his axe and went — never knowing he had been sent to die in another man’s place.

At midnight, the demon came — fangs bared, tail thrashing, changing its shape at will. Thach Sanh did not take a single step back. His axe came down, and the monster fell.

Where its body faded away, he found a bow and arrows made of gold, glittering in the dark. He picked them up and took them home.

When Ly Thong saw his sworn brother come home alive, he panicked. Then he lied.

Oh no — that python belonged to the king! Run, now. I’ll stay and deal with it.

Thach Sanh believed him, and quietly went back to his banyan tree. Ly Thong, meanwhile, carried the monster’s head to the capital and claimed he had killed it himself. The king was overjoyed, and made him a lord.

Not long after, as the princess walked in the palace garden, a giant eagle swooped out of the sky and carried her off.

As it flew over the banyan tree, Thach Sanh drew his golden bow and shot it. Feathers rained down — but the eagle kept flying, the princess still in its claws, all the way back to its cave.

The king ordered Ly Thong to find her, and Ly Thong came back to the banyan tree to ask for help. Following the trail of feathers, Thach Sanh led them to a deep, dark cave, and lowered himself down on a rope.

Deep in the cave, he fought the eagle and struck it down. Then he tied the rope around the princess, so the soldiers could pull her up.

The moment she reached the top, Ly Thong ordered his men to roll a huge boulder over the opening. Thach Sanh was buried alive.

In the darkness, he heard a cry for help. Deep inside the cave hung an iron cage, and in it was a young man. Thach Sanh broke it open with his axe. The young man, it turned out, was the son of the Water King, ruler of the world beneath the waters.

The Water King invited him to his underwater palace and offered him gold, silver and pearls. Thach Sanh took none of it. He asked for only one thing — a lute.

But his troubles weren’t over. The spirits of the python and the eagle were still out there. They crept into the royal treasury, stole the king’s gold, and dropped it at the foot of the banyan tree. Thach Sanh was arrested, and thrown into prison.

That night, in his cell, he took out the lute and began to play. The music seemed to tell the whole story — who killed the demon, who saved the princess, and who betrayed whom.

Since the day she was rescued, the princess had not spoken a single word. But when the music reached her, she burst into tears — and spoke.

That is the man who saved me.

The king summoned Thach Sanh, and the whole truth came out. Ly Thong fell to his knees, trembling. The king let Thach Sanh decide his fate — and Thach Sanh let him go home.

He was forgiven — but Heaven did not forgive. On the road home, Ly Thong and his mother were struck by lightning, and turned into dung beetles, crawling in the dirt forever.

Thach Sanh married the princess. But the princes of eighteen kingdoms she had once refused were furious. They marched their armies to the capital and surrounded its walls.

Thach Sanh did not take a sword to battle. He sat on the city wall, and played his lute. As the music rang out, the soldiers below went weak. They lowered their spears, thought of home, and no longer wanted to fight.

Then he brought out a tiny pot of rice, and invited the whole army to eat. The soldiers laughed — how could that feed anyone? But every time the pot was emptied, it filled up again. And again.

The armies of eighteen kingdoms bowed in thanks, and went home. A war had ended, and no one had died. In time, the old king gave his throne to Thach Sanh.

The tale of Thach Sanh has many versions, but almost every Vietnamese child hears it, learns it at school, and sees it on stage — in folk opera and in water puppet theatre.

It lives on in the language, too. In Vietnam, calling someone “a Ly Thong” means a two-faced friend who steals your credit. And anything that never runs out is called “Thach Sanh’s rice pot.”

A man betrayed again and again — who still chose kindness. And won, without killing anyone.