The Politician Who Founded Japan's First Samurai Government Yoritomo and Tsurugaoka Hachimangu

Tsurugaoka Hachimangu Shrine in Kamakura was central to Minamoto no Yoritomo and his retainers as they established Japan's first samurai government. How did a man who spent 20 years in exile rise to establish Japan’s first samurai government? And why did he ultimately turn against his own brother, Yoshitsune, the hero who helped defeat the Taira?

A Man Raises an Army Before the Deity of War

In 1180, Minamoto Yoritomo (1147~1199, 源頼朝) assembled his retainers before newly built Tsurugaoka Hachimangu Shrine. Standing before Hachiman deity of fighting, archery, and victory, he shouted at the top of his voice and prayed for success in upcoming battles against his long-time rivals, the Taira clan. At the age of 33, Yoritomo raised an army. This was after a two-decade-long exile in Izu Province, far from Kyoto, the political center of Japan.

Twenty Years in Exile

Twenty years earlier, in 1160, Yoritomo's father, Minamoto Yoshitomo (1123~1160, 源義朝), was defeated and killed in the Heiji Rebellion by the general Taira no Kiyomori (1118~1181, 平清盛). Immediately, Yoritomo was exiled to Izu Province at the age of 13, while his brother, Minamoto Yoshitsune (1159~1189, 源義経), was fostered at Kuramadera Temple in Kyoto at the age of 7. Meanwhile, Kiyomori rose to dominate the Imperial Court through the sources of power: the wealth he accumulated from trade between Japan and Sung China, military strength, and marriage ties with the Imperial family.

The Imperial Decree to Defeat the Taira Clan

As dissatisfaction with the overwhelming power of the Taira clan grew, Prince Mochihito, the sone of the cloistered Emperor Go-Shirakawa (1127~1192, 後白河上皇), issued an imperial decree in 1180 calling upon the Minamoto clan throughout Japan to overthrow the Taira.

Responding to the decree, Yoritomo raised his army. Yoshitsune also made his way to Kamakura to join his brother, Yoritomo. The military skills he had developed through rigorous training in the mountains surrounding Kurama-dera contributed greatly to the victories at the three decisive battles of Ichinotani, Yashima, and Dan-no-Ura.

The Fall of the Taira Clan at Dan-no-Ura

In 1185, the final battle between the Taira and Minamoto clans took place at Dan-no-Ura. The The Taira navy initially had the advantage, using the swift currents to their benefit and raining arrows on Yoshitsune’s forces. But when the tide turned, Yoshitsune seized the initiative.

One after another, members of the Taira clan threw themselves into the sea. Nii-no-Ama, the widow of Taira no Kiyomori, held her three-year-old grandson, Emperor Antoku (1178–1185, 安徳天皇), in her arms and drowned with him, along with one of the Three Imperial Regalia – the sacred sword. Taira no Munemori, the supreme commander of the Taira forces, was captured. With this defeat, the Taira clan came to an end.

The Three Conditions Behind Yoritomo's Success

Yoritomo's establishment of Japan's first samurai government was not simply the result of military victories or Yoshitsune's genius. It rested on three major factors.

1. Legitimate Descent from the Seiwa Genji Clan

Yoritomo belonged to the legitimate Seiwa Genji lineage, which traced its ancestry to Emperor Seiwa. His legitimacy enabled samurai from eastern Japan to recognize him as the rightful leader of the Minamoto clan and gather under his command.

2. Independence from Kyoto

Yoritomo established his base in Kamakura rather than Kyoto. By remaining far from the Imperial Court, he was able to build an independent political order in eastern Japan without interference from court politics.

3. Cool-Headed Political Leadership and His Brother's Military Genius

While Yoshitsune won battles, Yoritomo created and protected a new political order. The brothers played different but complementary roles: one achieved military victories, while the other established lasting rule.

Why Does Yoritomo Turn Against Yoshitsune?

After his triumphant return to Kyoto, Yoshitsune accepted appointment as kebiishi from Emperor Go-Shirakawa without Yoritomo's approval. This created a serious conflict.

The Kamakura government was built on a direct relationship of lord and vassal between Yoritomo and his retainers. Yoritomo granted his retainers honryo-ando— guaranteeing their estates. In return, they owed him hokou— the duty to fight for their lord, even at the cost of their lives.　

Yoshitsune was Yoritomo's younger brother. But he was also one of Yoritomo's retainers. By accepting an official position from the imperial court without his lord's permission, Yoshitsune had bypassed Yoritomo. To Yoritomo, this threatened the very foundation of the new political order. The brothers eventually became enemies.

Yoshitsune fled to Hiraizumi, seeking protection from the Oshu Fujiwara clan, which had sheltered him in the past. But Yoritomo continued to pressure the Fujiwara clan, eventually forcing them to hand Yoshitsune over.

Unable to resist Yoritomo's demands, the Fujiwara ordered Yoshitsune's death. Unwilling to  fight the family that had protected him, Yoshitsune withdrew into Jibutsudo Hall, recited Buddhist sutras, and took his own life in 1189 at the age of 31. Yoritomo then sent his forces to Hiraizumi, destroyed the Oshu Fujiwara clan, and secured control over eastern Japan.

For Yoritomo, political order came before the personal ties. This was the essence of the remarkably hard-headed politician who laid the foundation of samurai rule.

What Makes Yoritomo a Successful Leader?

In 1192, he was appointed shogun, formally becoming the leader of the samurai. Yoritomo’s achievement was not the work of one man alone. It was the combination of his political judgment, Yoshitsune’s military genius, and a new system of loyalty that bound the samurai to their lord. Kamakura was the stage on which this new form of leadership took shape—far from Kyoto and the politics of the Imperial Court.

The Kamakura government was built on a reciprocal relationship between lord and vassal. This relationship became the basis of samurai society, shaping the warrior order for centuries to come.

Today, walk through Kamakura and imagine the world Yoritomo created. At its heart stands Tsurugaoka Hachimangu Shrine, a landmark of the city and a powerful symbol of the Kamakura Shogunate.

Yoritomo & Yoshitsune Timeline

1147	Yoritomo was born	Yoritomo Age=1	Heian Period
1156	Hogen war	10
1159	Yositsune was born	Yositsune *Age=1
1159	Heiji war	13
1160	Yoritomo was exiled to Izu	14
1167	Taira no Kiyomori became Grand Minister of State	21
1169	Yoshitsune was placed in the care of the monks of Kurama temple	*11
1174	Yositune left Kramadera Temple and moved to Hiraizumi	*16
1180	Kiyomori's rival, Yoritomo raised an army to attack Kiyomori & his family	34/*22
1181	Kiyomori died of deceases	35
1185	Heike fell at the Dannoura War	39/*27
1185	Minamoto no Yoritomo established Kamakura shogunate	46	Kamakura Period
1189	Yoshitsune died	43/*31
1199	Yoritomo passed away	53
1333	The fall of Kamakura shogunate	-	Northern and Southern Courts

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