Ōtakemaru

Medieval Japan named three great evil yokai.

Shuten-dōji, the demon king who stole the capital's daughters. Tamamo-no- Mae, the nine-tailed fox who got into the palace and nearly killed an emperor.

And the third: Ōtakemaru, the storm-demon of the Suzuka Pass.

Why that pass

Because of where it is.

The Suzuka Mountains sit between the capital and the east. And that means every load of imperial tribute, every tax shipment, every official convoy moving between Kyoto and the eastern provinces had to walk over that pass.

There was no other way through.

Ōtakemaru robbed it.

He is, functionally, the chokepoint given a body — the one place where all the wealth of a country had to pass through a gap in the hills, and something was waiting there.

He fights with weather

This is what makes him different from the other two.

Shuten-dōji was a drinker in a hall. Tamamo was a beauty at court.

Ōtakemaru answers an army with black cloud, storm, and fire from the sky.

The general sent against him is Sakanoue no Tamuramaro — and Tamuramaro is real. Fully historical: the great general of Emperor Kanmu's era, the man who subdued the northeast, the first to hold the title of shōgun in the sense that mattered. His tomb exists. His temple offices are documented.

And the campaign grinds on for years. No clever plan. No disguise. Just a historical general trying to take a mountain pass off something that controls the weather.

And then his wife changes sides

Here's the ending, and no other great demon in Japan dies this way.

Suzuka Gozen is the celestial woman of the pass — in the early versions, married to Ōtakemaru.

She allies with Tamuramaro. In the romance versions, she falls in love with him.

And it is her aid that finally delivers the beheading.

Shuten-dōji fell to disguised guests and poisoned sake. Tamamo fell to diviners who saw through her.

Ōtakemaru fell to a change of allegiance at home.

The greatest demon-slaying campaign of the era, resolved as divorce proceedings. Two supernatural beings, a marriage, and a third party — and the demon loses because the person on the inside stopped being on his side.

There's a fuller apparatus in the longer tellings — three magic swords, a severed head with an afterlife, a revival and a second death — but the texts those come from need checking before I'd hand you the details as fact.

What he actually was

Tamuramaro is history. Ōtakemaru is his enemies, mythologized.

The pass was genuinely dangerous, and the danger was genuinely people — brigand-lordships controlling a chokepoint and taxing what came through it, which is one of the oldest businesses there is. Suppressing them was a real military campaign that took real years.

And it got compressed into one storm-demon.

That's a move this tradition makes repeatedly. The earth-spider is the same device — defiant local clans who wouldn't submit to the court, remembered as a monstrous arachnid. Call your opponents non-human and the campaign against them becomes a legend instead of a war.

The three of them, together

Line up the great three and you get a portrait of exactly what the court was afraid of.

Ōtakemaru — the mountain warlord. The provinces refusing to send the taxes.

Tamamo-no-Mae — the palace infiltrator. The beautiful, brilliant outsider who gets close to the throne and turns out to be something else.

Shuten-dōji — the abductor. The thing outside the capital that comes in and takes the daughters of good families.

Money, access, and children.

Three faces of the same anxiety, each given horns.