Minamoto Yoritomo and Tsurugaoka Hachimangu Shrine: The Birthplace of Japan's Samurai Government

Tsurugaoka Hachimangu Shrine in Kamakura was a cornerstone for the samurai, Minamoto no Yoritomo (1147–1199, 源頼朝), and his retainers in establishing the first samurai government in Japan. Until then, the samurai’s mission was to protect the emperors by force, acting as a kind of police unit called kebiishi. Yoritomo and his retainers aimed to establish "Government of the samurai, by the samurai, for the samurai." Its ruling structure was based on the direct ties of favor and service between Yoritomo and his retainers. The favor means honryo-ando (Yoritomo acknowledged the inherited estate), and the service means hou-kou (retainers' giving their lives to fight for Yoritomo).

Yoritomo's success in establishing the first samurai government depends on three major aspects: (1) A legitimate lineage of the Seiwa Genji clan connected to Emperor Seiwa, (2) Independence from Kyoto (the Imperial Court politics), and (3) His cool-headed political ability with his brother, a military genius, Yoshitsune.

A Man Raised an Army Before the God of War

In 1180, Yoritomo gathered his retainers before Tsurugaoka Hachimangu Shrine in Kamakura. Standing before Hachiman, the deity of war, archery, and victory, he prayed loudly for success in the coming battles against his long-time rivals, the Taira clan. At the age of 33, Yoritomo raised an army. Until then, he had spent twenty years in 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 no 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 no Yoshitsune (1159–1189, 源義経), was fostered out to Kuramadera Temple in Kyoto at the age of 7. Meanwhile, Kiyomori rose to dominate the Imperial Court through three sources of power: the wealth he accumulated from trade between Japan and Song 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 son 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

The final battle took place at Dan-no-Ura on May 2, 1185. At first, the Taira navy held the advantage by taking advantage of the swift tidal currents and raining arrows on the enemy. This enabled them to push Yoshitsune’s army back. However, when the tide turned, Yoshitsune seized the initiative.

Many of the Taira family found themselves at a standstill and so began throwing themselves into the sea one after another. Nii-no-Ama, Kiyomori's widow, held her three-year-old grandson, Emperor Antoku (1178–1185, 安徳天皇), in her arms and drowned with him, carrying the sword, one of the Imperial Regalia. Taira no Munemori, Kiyomori's son and the supreme commander of the Taira forces, was captured. With this defeat, the Taira clan came to an end.

Why Does Yoritomo Turn Against Yoshitsune?

After returning triumphantly to Kyoto, Yoshitsune accepted appointment as kebiishi from Go-Shirakawa without Yoritomo's approval. This created serious conflict.

The Kamakura government was founded on direct ties of favor and service between Yoritomo and his retainers. Favor meant honryo-ando—Yoritomo's guarantee of inherited estates—while service meant hoko—the retainers' willingness to fight and even sacrifice their lives for their lord.

Although Yoshitsune was Yoritomo's younger brother, he was also one of his retainers. Receiving an official court appointment without his lord's permission 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, where he had once lived. Once Yoritomo learned of his whereabouts, he repeatedly pressured the Fujiwara clan to surrender him.

Unable to resist Yoritomo's demands, the Fujiwara finally ordered Yoshitsune's death. Refusing to fight against the family that had protected him, Yoshitsune withdrew into the Jibutsudo Hall, recited Buddhist sutras, and took his own life in 1189 at the age of 31. Afterward, Yoritomo sent troops to Hiraizumi, destroyed the Oshu Fujiwara clan, and secured control over eastern Japan. Yoritomo's willingness to place political order above personal ties reveals the qualities of a remarkably hard-headed politician.

The Foundation of the Samurai World: Favor and Service

Shortly afterward, Yoritomo went to Kyoto and was appointed Ukone-no-Daisho (the highest military office) by Go-Shirakawa. In 1992, he became Seii Taishogun (the Great General), marking him the supreme leader of the samurai in both name and reality.

Kamakura became Japan's first city of the samurai government, governing primarily eastern Japan. Its foundation rested on the reciprocal relationship of favor and service between Yoritomo and his retainers. Yoritomo guaranteed his retainers' ownership of their estates-property as valuable as life itself. In return, they provided military service whenever called upon. This governing system continued until the late 16th century, when Oda Nobunaga (1534~1582, 織田信長) was on the verge of unifying Japan.

The Three Conditions Behind Yoritomo's Success

Yoritomo's success depended on three key foundations: his legitimate Seiwa Genji lineage, his decision to establish his government in Kamakura rather than Kyoto, and his ability to build a stable political order while working alongside his younger brother Yoshitsune, whose military victories secured their position. Just as importantly, he united the samurai of eastern Japan through a new master-retainer relationship based on mutual loyalty and service.

1. Legitimate Descent from the Seiwa Genji Clan

Yoritomo belonged to the legitimate Seiwa Genji lineage, which traced its ancestry to Emperor Seiwa. This prestigious heritage gave him the authority to unite the samurai of eastern Japan as the rightful head of the Minamoto clan.

2. Independence from Kyoto

Instead of remaining in Kyoto, Yoritomo established his base in Kamakura. Its distance from the Imperial Court allowed him to develop an independent political system free from court influence.

3. Yoritomo's Political Leadership and Yoshitsune's Military Genius

While Yoshitsune won battles, Yoritomo focused on building and preserving a durable system of government. The brothers played different but complementary roles: one achieved military victories, while the other established lasting rule.

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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