New Year, 1108 — the Heir of Minamoto no Yoshiie Is Cornered in Izumo
The 1st month, the third year of Kasho (1108).
An army that had marched west along the San’in Road entered Izumo Province.
Its commander was Taira no Masamori.
The man known to history as the grandfather of Taira no Kiyomori.
The troops Masamori personally commanded numbered roughly 240 to 250 — mostly warriors of his own clan, together with men from Iga Province, where he held land.
But this was not the full strength of the punitive force.
The court had granted Masamori the authority to muster warriors from
Izumo, Inaba, Hoki, Oki, and either Iwami or Bingo —
a total of five provinces.
Masamori advanced west from his own province of Inaba, gathering more men in Hoki along the way, and entered Izumo on the 6th day of the 1st month of 1108.
His target was no minor local power.
The second son of “Hachiman Taro” Minamoto no Yoshiie, and, after his elder brother Yoshimune died young, the man who became heir to the Kawachi Genji.
Only a few years earlier, this was a man expected to carry the Kawachi Genji into its next generation.
Now he stood under an imperial punitive order, preparing to face down Taira no Masamori — a man of a far lower house rank than his own.
Minamoto no Yoshichika — the Man Meant to Succeed “Hachiman Taro”
Yoshichika’s birth year is unknown.
His father was Minamoto no Yoshiie.
His mother was a daughter of Minamoto no Takanaga, Governor of Mikawa.
Yoshiie had several sons, but after the eldest, Yoshimune, died young, the second son, Yoshichika, became his heir.
His father, Yoshiie, was the leading figure of the Kawachi Genji of his day.
At nineteen, in the Former Nine Years War, he had lived through the killing ground of Koromogawa; in the Later Three Years War, he had intervened as Governor of Mutsu in the internal feud of the Kiyohara clan of Oshu. Afterward he won deep loyalty from the warriors of the east, rose in 1098 to Junior Fourth Rank, Lower Grade, and was even granted access to Retired Emperor Shirakawa’s own palace.
Later generations would praise him as “the foremost warrior under heaven.”
Yoshichika stood in the position of inheriting that martial reputation.
He too advanced steadily, through the post of Left Palace Guard Lieutenant to Governor of Tsushima.
Up to this point, it was the smooth career one would expect of the heir of the Kawachi Genji.
But once he took up his post in Kyushu, Yoshichika’s life began to change dramatically.
1101 — Dazaifu Files a Complaint Against Yoshichika
The third year of Kowa (1101).
Word reached Kyoto from Dazaifu accusing Yoshichika of wrongdoing.
As Governor of Tsushima, Yoshichika had entered Kyushu only to repeatedly ignore Dazaifu’s authority and embezzle tax revenue.
Some sources go further, recording the killing and plunder of local people.
Dazaifu, which oversaw both the administration and the military affairs of the entire western seaboard, could not simply overlook a provincial governor wielding force in open defiance of its authority.
Dazaifu brought its complaint to the court.
The Dazai no Daini, the office’s senior official, at the time was none other than Oe no Masafusa.
A man deeply tied to Yoshichika’s own father, Yoshiie.
The later Oshu Gosannen ki portrays him as the scholar who taught strategy to the young Yoshiie, once a man who relied on valor alone.
That same Masafusa now found himself pursuing the son of the man he had once mentored.
Even Yoshiie Himself Acted — and Still Yoshichika Would Not Return
The court did not immediately send a large army against Yoshichika.
His opponent was the heir of Minamoto no Yoshiie himself.
So it first tried to settle the matter through his father, Yoshiie.
Yoshiie sent his own retainers to Kyushu, hoping to bring his son back to Kyoto.
The attempt at persuasion failed.
It is said the situation grew so bad that the men sent to retrieve Yoshichika instead joined his side, and that a messenger dispatched by the court was killed.
Yoshiie was a man who commanded the loyalty of countless warriors across the eastern provinces.
Even he could not bend his own heir to his will.
From the vantage point of Kyoto, Yoshichika could no longer simply be handled gently as “Yoshiie’s son.”
1102 — the Heir of the Kawachi Genji Is Exiled to Oki
The 12th month, the fourth year of Kowa (1102).
Yoshichika’s sentence was decided.
Exile to Oki.
Matsue City’s own history records that Yoshichika was sent to Oki in the third month of the following year, 1103. Other sources, however, suggest he only got as far as Izumo and never actually crossed to Oki itself — his movements after the sentence remain uncertain.
The heir of the Kawachi Genji had become an exile.
This was a heavy blow to Yoshiie.
And Yoshiie himself was hardly a man in decline at the time.
He had already been granted access to the retired emperor’s palace, and was hailed as the foremost warrior under heaven.
The father was approaching the very summit of the warrior class.
His son was being exiled to a distant province by the court.
It was a strange and jarring situation.
1106 — Yoshiie Dies With His Son’s Problem Still Unresolved
The 4th day of the 7th month, the first year of Kasho (1106).
Minamoto no Yoshiie died.
Sixty-eight by traditional count.
He died without ever fully resolving the problem of Yoshichika.
From here, the situation of the Kawachi Genji grew sharply worse.
As long as Yoshiie was alive, even punishing Yoshichika meant reckoning with the presence of a father hailed as “the foremost warrior under heaven.”
That father was gone now.
And the following year, 1107.
Yoshichika reappeared on the stage of history.
And this time, he turned his weapons directly against the court’s own provincial administration.
June 1107 — Yoshichika Crosses Into Izumo
The 6th month, the second year of Kasho (1107).
Yoshichika crossed into Izumo Province.
What followed is often summarized simply as “Yoshichika ran wild in Izumo.”
In fact, it was a somewhat larger affair than that.
The Governor of Izumo at the time was Fujiwara no Ieyasu.
Yoshichika’s side killed the deputy governor Ieyasu had entrusted with local administration.
They further seized tax revenue and other government property.
They killed the provincial governor’s own deputy and seized the wealth that governor was meant to carry back to Kyoto.
This was not a matter of personal banditry.
It was an act of force turned directly against the court’s own provincial rule as it operated through the Izumo government office.
Yoshichika Was Not Rampaging Alone
This point matters a great deal.
Treating the Rebellion of Minamoto no Yoshichika as simply “a violent man named Yoshichika running amok alone” misses a great deal of what actually happened.
Matsue City’s history notes that when Yoshichika rose up, forces sympathetic to him existed in the surrounding provinces as well.
After the punitive campaign, twelve men said to have fought alongside Yoshichika were killed and beheaded.
In other words, Yoshichika was not simply fleeing about with a handful of retainers.
He had supporters not only in Izumo but in the provinces around it.
Behind this lay ongoing friction between provincial governors and local powers.
A provincial governor collected taxes and other revenue from his assigned province and carried that wealth back to Kyoto.
Naturally, this put him at odds with local figures who held land and interests of their own on the ground.
It seems highly likely that Yoshichika was raised up as a leader for local forces resentful of their provincial governors.
That is why the Rebellion of Minamoto no Yoshichika did not remain merely the misconduct of one Genji warrior.
“The Cave of Kumodo” — Yoshichika Held a Harbor
The sources name the place where Yoshichika made his stand as
“the Cave of Kumodo.”
This is thought to correspond to present-day Kumozu, in the Mihonoseki district of Matsue City, Shimane Prefecture.
Kumozu faces the sea.
It also appears in the Izumo no Kuni Fudoki as “Kumoto no Ura,” recorded as a harbor able to anchor ten ships.
It connected to the sea route to Oki, and was positioned to link into maritime traffic running east and west along the Sea of Japan coast.
Yoshichika is said to have built a “fort” in the cave at Kumozu.
He had not simply fled deep into the mountains.
He had chosen a place backed by a harbor, one from which he could escape by sea, stay in contact with Oki, and easily bring in supplies.
This posed a real problem for Masamori, tasked with hunting him down.
Leave Yoshichika alone too long, and he might use the sea to relocate elsewhere entirely.
Local forces in the surrounding area might rally to him further still.
The matter had to be settled quickly.
December 19, 1107 — Retired Emperor Shirakawa Chooses Taira no Masamori
About half a year after Yoshichika first appeared in Izumo.
On the 19th day of the 12th month, the second year of Kasho (1107), the court formally ordered his suppression.
The man chosen to lead the punitive force was Taira no Masamori.
At the time, Governor of Inaba.
Here, for the first time, the positions of the Genji and the Taira were symbolically reversed.
Not long before, the warrior who represented the court had been Minamoto no Yoshiie.
Now the man chosen to strike down that same Yoshiie’s son was Masamori of the Taira.
Masamori was not yet the towering figure his descendant Taira no Kiyomori would become.
He had originally served close attendants of Retired Emperor Shirakawa, Fujiwara no Tamefusa and Fujiwara no Akisue, and had climbed the ranks as a provincial governor from the 1090s onward.
In 1097, he donated land to a temple dedicated to the memory of one of Retired Emperor Shirakawa’s own daughters, strengthening his ties to the retired emperor.
By 1106 he was Governor of Inaba.
And the following year, he was handed the great task of striking down the son of Minamoto no Yoshiie.
Masamori’s Own Force Was 240 to 250 — but the Real Army Grew Far Larger
Let’s look at this war through its numbers.
Taira no Masamori‘s own direct force numbered roughly 240 to 250.
It was made up of his own clansmen together with residents of Iga Province, where he held land.
He did not storm into Izumo with only these 250 or so men.
As the appointed commander of the punitive force, Masamori had been granted the authority to muster warriors from the surrounding provinces as well.
The provinces covered were
Izumo, Inaba, Hoki, Oki, and either Iwami or Bingo —
five provinces in all.
This was the true strength of being a court-appointed punitive commander.
Even with only 250 men of his own house, carrying the banner of “an order from the court” let him draw on local warriors through each province’s own administrative office.
Leaving Kyoto, Masamori entered his own province of Inaba first.
From there, on to Hoki.
Gathering more men as he advanced, he closed in on the Izumo border.
The San’in Road in Winter — Masamori’s Army Marches West
The order for suppression came down on the 19th of the 12th month.
The new year arrived.
Masamori’s army pushed west through Inaba and Hoki.
This was nothing like traveling modern roads.
This was San’in in winter. Crossing mountains, fording rivers, moving troops on horse and on foot.
And an army needs more than weapons — it needs provisions.
Even for a force of only a few hundred, if each man consumed roughly five go of rice a day, five hundred men alone would need some 250 sho — nearly 450 liters — in a single day.
For a thousand men, double that.
The exact makeup of supplies and troop numbers cannot be fixed from the sources, but any force drawing on mustered men from multiple provinces as it advanced could not have done without food, horses, and lodging supplied through each province’s own administrative office.
Yoshichika had local allies on the ground.
Masamori had the logistical network of the state itself.
That was the decisive difference.
January 6, 1108 — Masamori Enters Izumo
The 6th day of the 1st month, the third year of Kasho (1108).
Masamori’s army entered Izumo.
Only eighteen days after the punitive order had been issued on the 19th of the 12th month.
He had organized his army across the New Year holiday, gathered troops in Inaba and Hoki, and pushed on into Izumo.
That is remarkably fast.
The fighting with Yoshichika’s side began from here.
No detailed war chronicle survives for this campaign, unlike the Mutsu Waki‘s account of the Former Nine Years War.
From which direction the attack came, how long it lasted —
no source survives that can reconstruct that level of detail.
Even so, the surviving dates alone convey just how fast this war moved.
A Mere Dozen-Odd Days From January 6 — Yoshichika’s Forces Collapse
Masamori entered Izumo on the 6th of the 1st month.
By the 19th of the 1st month.
Word had already reached Kyoto that “Minamoto no Yoshichika has been slain.”
Izumo and Kyoto lie hundreds of kilometers apart even as the crow flies.
Carrying news of a successful suppression naturally took time as well.
Which means the actual fighting had ended before the 19th of the 1st month.
From Masamori’s entry into Izumo to Yoshichika’s defeat: at most a dozen-odd days.
In reality, probably even less.
The Former Nine Years War lasted twelve years. The Later Three Years War lasted five.
Against that backdrop, the final military clash of the Rebellion of Minamoto no Yoshichika was settled in a startlingly short span of time.
Why Did Yoshichika Lose So Quickly?
The gap between the two sides was more than a matter of numbers.
Yoshichika had local support.
He held the harbor at Kumozu.
But Masamori carried the court’s own formal order of suppression.
Inaba. Hoki. Izumo. Oki. And either Iwami or Bingo.
He could gather the warriors of each province as an “official army.”
Anyone who sided with Yoshichika now risked becoming the court’s next target for suppression himself.
Indeed, twelve of the men who fought alongside Yoshichika are recorded as having been killed.
The longer the war dragged on, the greater the danger grew for anyone still standing with Yoshichika.
Side with Masamori instead, and one could fight as part of the court’s own forces.
Yoshichika’s greatest weakness was that he had made an enemy of the state itself.
“Minamoto no Yoshichika, Slain” — Masamori’s Report Reaches Kyoto
No detailed account survives of exactly how Yoshichika met his end.
What is recorded is that Taira no Masamori‘s report stated he had killed Yoshichika, along with the heads of those who had followed him.
Records related to the Chuyuki confirm that Masamori’s victory report reached Kyoto on the 19th of the 1st month.
On receiving it, Retired Emperor Shirakawa moved immediately to consider rewards.
This, too, was unusual.
Masamori was still in Izumo.
He himself had not yet returned to Kyoto.
And still, the discussion moved forward on the premise that
rewards should be granted without waiting for Masamori’s return.
That is how significant a triumph the suppression of Yoshichika was to Retired Emperor Shirakawa.
January 24 — Masamori Becomes Governor of Tajima
Only a few days after the report of his success.
At the appointments of the 24th of the 1st month, Masamori moved from Governor of Inaba to Governor of Tajima.
Tajima ranked higher than Inaba as a province and offered better prospects for income.
And Masamori was not the only one rewarded.
His kinsman Taira no Morisada received the post of Right Gate Guard Lieutenant; Taira no Moriyoshi, Left Palace Guard Lieutenant. Even the Taira warriors in Masamori’s own circle gained official rank.
The suppression of Yoshichika was not simply Masamori’s own personal advancement — it lifted the whole standing of the Ise Taira clan gathered around him.
January 29 — Yoshichika’s Head Enters Kyoto
On the 29th of the 1st month, Masamori returned to Kyoto.
Twenty-three days after arriving in Izumo.
He carried with him the heads of Yoshichika and his men.
For the people of Kyoto, this sight must have struck hard.
Barely two years earlier, Minamoto no Yoshiie — hailed as “the foremost warrior under heaven” — had still been alive.
Now it was a warrior of the Taira who carried home his son’s severed head.
Few scenes could illustrate a shift of eras more plainly.
The main line of the Genji struck down; a Taira commander returning in triumph.
What happened in Kyoto in 1108 was not simply the execution of a criminal.
It was the moment the balance of power among the warrior houses began to shift.
A Question That Lingered Even After — “Was That Really Yoshichika?”
And yet this war left behind a strange aftertaste.
Yoshichika was known as a man who had inherited his father’s own valor.
Taira no Masamori had struck him down in an implausibly short span of time.
And the detailed course of the fighting had never fully reached Kyoto.
So a doubt arose: “was the man Masamori killed really Yoshichika at all?”
Even after Yoshichika’s head reached Kyoto, that suspicion never fully went away.
In fact, in the years that followed, men claiming “I am Minamoto no Yoshichika“ kept appearing in various provinces.
1117 — the “Dead” Yoshichika Reappears
Nine years after Yoshichika’s suppression, in the fifth year of Eikyu (1117).
A man calling himself “Minamoto no Yoshichika” appeared in Echigo Province.
Similar figures went on appearing afterward in Hitachi, Omi, and elsewhere, and the belief that Yoshichika had survived persisted until around 1130.
They cannot all have been genuine.
What matters is that the conditions for “claim to be Yoshichika, and people will gather” had never gone away.
Matsue City’s history points to lingering resentment toward provincial governors and the court as the backdrop for this.
Yoshichika had never been merely a fugitive criminal.
To local forces chafing under their governors, the name “the son of Hachiman Taro Yoshiie” itself could serve as a banner of resistance against the center.
When Yoshichika Died, His Son Tameyoshi Was Thirteen
Yoshichika had a son.
Born in 1096.
When Yoshichika was killed in 1108, he was thirteen by traditional count.
His grandfather, Yoshiie, was already dead.
His father, Yoshichika, had been struck down as an enemy of the court.
The two men who had built the reputation of the Kawachi Genji had both vanished within the span of just two years.
Even so, the Kawachi Genji still had another of Yoshiie’s sons: Minamoto no Yoshitada.
If Yoshitada could hold the clan together, there was still room to rebuild.
But the following year, 1109.
Yoshitada, too, was attacked in Kyoto.
The Assassination of Minamoto no Yoshitada.
The true collapse of the Kawachi Genji did not end with Yoshichika’s death alone.
From Masamori, to Tadamori, to Kiyomori
The victor, Taira no Masamori, went on to continue serving Retired Emperor Shirakawa’s own military needs.
Masamori’s son was Taira no Tadamori.
Tadamori inherited his father’s footing as a provincial governor and his ties to the retired emperor, and expanded his power further still through involvement in maritime trade and shipping in the western provinces.
Tadamori’s own son was Taira no Kiyomori.
At the time of the suppression of Minamoto no Yoshichika in 1108, Kiyomori had not yet been born.
Even so, the current that would carry the Taira forward began right here.
Kill the son of Minamoto no Yoshiie. Masamori becomes Governor of Tajima. Office and rank flow to the Taira clan around him.
Standing rises as the house entrusted with the retired emperor’s military affairs. That accumulated standing passes from Masamori to Tadamori, and from Tadamori on to Kiyomori.
The later “age of Taira rule” was not something Kiyomori conjured alone, out of nowhere, in a single generation.
The foundation had been laid step by step, going all the way back to the era of his grandfather Masamori.
The Taira Who Struck Down the Genji Heir — 1108, the Tide Turns
The Rebellion of Minamoto no Yoshichika had nothing like the great pitched battles of thousands against thousands seen in the Former Nine Years War.
No war chronicle survives recording casualty figures or troop deployments in detail, the way accounts of Koromogawa or Kuriyagawa Stockade do.
Even so, tracing the dates alone makes the character of this war unmistakably clear.
In the 6th month of 1107, Yoshichika rose up in Izumo.
On the 19th of the 12th month, the order to suppress him went to Masamori. His own troops numbered 240 to 250. The court authorized mustering from five provinces.
On the 6th of the 1st month of 1108, Masamori’s army reached Izumo.
By the 19th of the 1st month, word of a successful suppression had reached Kyoto.
On the 24th of the 1st month, Masamori was promoted to Governor of Tajima.
On the 29th of the 1st month, he returned to Kyoto in triumph, carrying the heads of Yoshichika and his men.
From the order of suppression to his return to the capital: a mere 41 days.
From entering Izumo to returning to Kyoto: just 23 days.
The martial reputation of the Kawachi Genji, built across decades by Hachiman Taro Yoshiie.
Yoshichika, meant to inherit it, was struck down as an enemy of the court less than two years after his father’s death.
And Masamori, the man who struck him down, went on to push the Ise Taira — long overshadowed by the Kawachi Genji — into the center of court politics.
Yoshichika’s defeat and Masamori’s rise were the two faces of the same war.
Exactly where the Genji began to sink, the Taira began to rise.
And the Kawachi Genji still had one more tragedy waiting for them.
Barely a year after Yoshichika’s death.
This time it was Minamoto no Yoshitada, who had succeeded Yoshiie, who was assassinated in Kyoto.
The next chapter, dragging the Kawachi Genji into deeper turmoil still, was about to begin.
