The Mystery of Cattle and Horses Explains Japan’s “Missing 150 Years”
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After Himiko’s death, Japan vanished from Chinese records for 150 years. Why? The sudden spread of cattle and horses may hold the key to this ancient mystery.
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Introduction｜Why Is Himiko’s Successor Such a Mystery?
One of the greatest enigmas in ancient Japanese history is the story of Himiko’s successor and the so-called “missing 150 years.”
Himiko, the queen described in The Records of Wei (Wei Zhi), is widely known. But after her death, a young girl named Iyo (also written Toyo) briefly appears as her successor. Then, suddenly, Japan disappears from Chinese chronicles. It re-emerges only in the 5th century with the appearance of the “Five Kings of Wa.”
Why did a 150-year gap open in the historical record?
And could the key to solving this mystery lie in the introduction of cattle and horses to the Japanese archipelago?
This article explores the drama from Himiko through Iyo to the Five Kings of Wa, combining archaeology, history, and bold hypothesis-building.
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Table of Contents
1. What Were the “Missing 150 Years”?
2. Himiko and Iyo in the Wei Zhi
3. What “No Cattle, No Horses” Really Means
4. Archaeological Evidence of Horses in the 4th–5th Century
5. Why Were Cattle and Horses Introduced into Japan?
6. Wars on the Korean Peninsula and the Flow of Technology
7. From Ritual to Force｜Iyo’s Politics and the Rise of the Military Elite
8. How Cattle and Horses Transformed Ancient Society
9. Giant Tombs and Horse Gear as Symbols of a New Regime
10. Who Were the Five Kings of Wa? Were They Emperors?
11. Why This Theme Resonates Today
12. Conclusion｜Unanswered Questions: Were the Five Kings Truly Emperors?
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1. What Were the “Missing 150 Years”?
The “missing 150 years” refers to the period from the mid-3rd century (after Himiko’s death) until the early 5th century (the emergence of the Five Kings of Wa) when Japan (Wa) is scarcely mentioned in Chinese historical records.
Himiko (early to mid-3rd century): described in detail in the Wei Zhi.
Iyo (Toyo): a 13-year-old girl who restored order after Himiko’s death.
Afterwards: silence in Chinese sources.
5th century: the “Five Kings of Wa” suddenly appear, offering tribute to the Southern Dynasties of China.
During this gap, archaeology reveals massive changes: the rise of giant keyhole tombs, the spread of iron, and the sudden appearance of horse gear. The chronicles are silent, but the soil speaks loudly.
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2. Himiko and Iyo in the Wei Zhi
The Wei Zhi tells us:
Himiko ruled with shamanic power, sent envoys to Wei, and was given the title “Queen of Wa, Friend of Wei.”
Iyo (Toyo) took the throne at age 13 after Himiko’s death, calming domestic chaos.
Yet after Iyo, there is nothing. The records fall silent. And thus begins the “missing 150 years.”
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3. What “No Cattle, No Horses” Really Means
The Wei Zhi states plainly:
> “In Wa, there are no cattle or horses.”
This brief line carries huge implications.
Military: Without horses, cavalry did not exist.
Communication: Without horses, orders and news traveled slowly.
Agriculture: Without cattle, large-scale plowing and irrigation were difficult.
Transport: Without ox carts, heavy goods could not be moved far.
In short, 3rd-century Japan was a society powered only by human muscle and boats.
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4. Archaeological Evidence of Horses in the 4th–5th Century
But by the late 4th and early 5th centuries, the picture changes dramatically:
Horse gear (stirrups, bits, saddle fittings) suddenly appears.
Horse-shaped haniwa (clay figures) are buried in tombs.
Horse bones show actual use and breeding.
The speed of this cultural shift suggests something massive had occurred during the “missing years.”
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5. Why Were Cattle and Horses Introduced into Japan?
The introduction of cattle and horses was not random. It must be understood in the context of the tumultuous Korean Peninsula.
313 CE: The fall of Lelang Commandery → Chinese withdrawal from the peninsula.
Goguryeo expansion threatened Baekje, Silla, and Gaya.
Technology and people on the move: blacksmiths, horse handlers, artisans.
Japan was the natural destination. In times of war, knowledge and skills flow to safer, wealthier patrons. Wa became the place to supply.
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6. Wars on the Korean Peninsula and the Flow of Technology
We can imagine several scenarios:
Scenario A: Migration of refugees and artisans who brought horses and iron with them.
Scenario B: Military alliances and trade, where horses and cattle were exchanged for iron or support.
Scenario C: Marriage diplomacy, with livestock brought as dowry or tribute.
Whichever it was, horses and iron likely arrived as a package deal.
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7. From Ritual to Force｜Iyo’s Politics and the Rise of the Military Elite
Iyo, like Himiko, was a shaman-queen who ruled through ritual and words. But the arrival of horses shifted the axis of power.
The Queen’s power: charisma, ritual, spiritual legitimacy.
The Warrior’s power: speed, cavalry, expensive gear that only wealthy elites could afford.
This may explain why Iyo’s successors vanish from history: the very foundation of rule was shifting from female ritual authority to male military power.
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8. How Cattle and Horses Transformed Ancient Society
Agriculture & Engineering: Oxen enabled irrigation projects and the construction of giant tombs.
Military: Horses revolutionized warfare, enabling cavalry tactics and rapid movement.
Communication: The beginnings of a courier system (proto-“umaya”) allowed orders to spread quickly.
Ritual: Horses became symbols of kingship, as horse haniwa show. To control a horse was to control power itself.
Cattle and horses were not just animals—they were technologies of state formation.
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9. Giant Tombs and Horse Gear as Symbols of a New Regime
The 4th–5th centuries saw the rise of enormous keyhole-shaped tombs. Moving stones, timber, and earth for such projects likely required oxen.
Meanwhile, horse gear is concentrated in regions linked to the Yamato polity. This strongly suggests that control over horses and their gear equaled control over political power.
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10. Who Were the Five Kings of Wa? Were They Emperors?
By the 5th century, the Five Kings of Wa (San, Chin, Sai, Ko, Bu) appear in Chinese records, sending tribute to the Southern Dynasties.
But were they the same as the emperors in Japan’s later chronicles (Nihon Shoki)?
Identity theory: San = Emperor Nintoku, Bu = Emperor Yūryaku, etc.
Divergence theory: The Five Kings were Yamato rulers, but not identical to the emperors of the chronicles.
This debate remains unresolved.
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11. Why This Theme Resonates Today
Himiko and Iyo represent the age of words and ritual.
The Five Kings of Wa represent the age of weapons and diplomacy.
It was a shift from charisma to cavalry, from prayer to power.
This tension—between ideals and infrastructure—still resonates today, whether in politics, business, or personal life.
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12. Conclusion｜Unanswered Questions: Were the Five Kings Truly Emperors?
To summarize:
After Himiko’s death, Iyo ruled briefly.
Then came the “missing 150 years.”
During this silence, cattle and horses were introduced, revolutionizing agriculture, warfare, and transport.
By the 5th century, the Five Kings of Wa stood before China with a new kind of state.
And yet, one question remains:
Were the Five Kings truly the emperors of Japan?
Or were they different rulers, whose identities became blurred across chronicles and centuries?
The truth is still hidden in the soil, waiting for us to piece together.
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A Question to You, the Reader
What do you think?
Was the missing 150 years really empty—or was it a time of silent revolution?
Were the Five Kings the same as the emperors of Japan—or someone else entirely?
I’d love to hear your thoughts in the comments. Every perspective could be another thread in solving this ancient mystery.
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