The Eikyo Disturbance

The Eikyo Disturbance: The Great Upheaval in Kanto Sparked by Conflict Between the Kamakura kubō and the Shogun

From Eikyo 10 (1438) to Eikyo 11 (1439), the "Eikyo Disturbance," which unfolded in Kanto, was an internal conflict that erupted from fundamental contradictions regarding the Muromachi bakufu's provincial control system and the existence of the Kamakura府 (Kamakura kubō) that functioned as a semi-independent regime. As a result of this disturbance, Ashikaga Mochiunji (1398–1439), the Kamakura kubō, was driven to commit suicide, and the independent Ashikaga regime based in Kamakura effectively came to an end. And Kanto's warrior society subsequently descended into the "Kyotoku Disturbance," a major upheaval that would last more than thirty years.

The Kamakura府 and Kamakura kubō: The Ashikaga Branch Regime That Ruled Kanto

The Muromachi bakufu was based in Kyoto, but to govern the distant Kanto region, it dispatched prominent Ashikaga family members to Kamakura and entrusted them with the title "Kamakura kubō," giving them control over ten provinces of the Kanto region, including Kai, Shinano, Izu, and Suruga. From the first Kamakura kubō, Ashikaga Motouji, onward, his descendants inherited this position in succession. Below the Kamakura kubō was a post called "Kanto Kanrei" (Kanto deputy), a position of support that the Uesugi clan held hereditarily.

Although the Kamakura府 appeared to be a branch office of the bakufu, in reality it was a semi-independent regime separate from Kyoto. Kamakura had been the sacred center of eastern warriors since Minamoto Yoritomo, and the Kamakura kubō held independent authority and a power base as the "lord" of Kanto warriors. From the time of Ashikaga Mochiunji's father, Ashikaga Mitsukanet, the Kamakura府 pursued independent policies that ignored the bakufu's wishes, and the relationship between the shogun and the Kamakura kubō was in a state of chronic tension.

Mochiunji's Pursuit of Independence and Escalating Conflict with Yoshinori

The turning point came in Eikyo 1 (1429) with Yoshinori's assumption of the position of shogun. Yoshinori, known for his strong-fisted politics, had no intention of tolerating Mochiunji's independent actions. Yoshinori deliberately escalated his conflict with Mochiunji and maneuvered to set Mochiunji at odds with Kanrei Uesugi Norizane.

Ashikaga Mochiunji was a warrior of exceptional martial prowess, but in political judgment he was sometimes arbitrary. Mochiunji did not use Yoshinori's era name (Eikyo), the era name of the shogun of the bakufu, but continued to use his own—an open defiance of the bakufu. Furthermore, Mochiunji refused procedures such as coming-of-age ceremonies and official appointments that Yoshinori initiated, and the relationship between the two deteriorated beyond repair.

Norizane, originally in a position to support the Kamakura kubō, reached the limit of his patience with Mochiunji's arbitrary political management and open defiance of the bakufu. Norizane was a cultured warrior with deep knowledge of learning and culture, having devoted himself to the restoration of the Ashikaga School (present-day Ashikaga City, Tochigi Prefecture). The deterioration of the relationship between Norizane, who valued "culture over martial prowess," and Mochiunji, who took pride in the martial way, reflected fundamental differences in their personalities and political outlooks. In Eikyo 10 (1438), Norizane requested the bakufu to launch a punitive campaign against Mochiunji. Yoshinori immediately assented, and bakufu military support was decided.

The Soshu School of Swordcraft and Kanto Bushido: The Warrior Culture That Sustained the Eikyo Disturbance

The mid-Muromachi period (early 15th century) in which the Eikyo Disturbance occurred is particularly notable for the relationship between warrior culture and swordcraft in the Kanto region. Since the Kamakura period, Kanto warriors had been called "Bando samurai," and their fearless martial spirit was known throughout the land. Kanto warriors, who had gained practical battle experience through the conflicts of the Northern and Southern Courts period, had developed a distinctive warrior culture that valued practical swordcraft.

Chief among the swords favored by Kanto warriors of this era were those descending from the Soshu school (Soshu-den). The Soshu school, which developed centered on Sagami Province (present-day Kanagawa Prefecture) and Kamakura, represents a technical tradition perfected by master smiths such as Masamune, Yukimitsu, and Sadamune. Its distinguishing characteristic is the rough yet beautiful tamahagane substrate on which granular crystals called "nie" appear in the hamon (blade pattern). The large nie of Soshu swords gives the viewer an overwhelmingly powerful impression. Mochiunji, based in Kamakura, is considered to have been raised within this cultural context and held pride in the identity of Kanto warriors and in the "Bando blade."

On the other hand, Kanto Kanrei Uesugi Norizane was known as a cultured warrior with deep knowledge of learning and culture. Norizane devoted himself to the restoration of the Ashikaga School and valued the spirit of culture over martial prowess. In swordcraft too, he apparently tended to seek spiritual beauty rather than practical ferocity. The Eikyo Disturbance was also a conflict in which bearers of such different warrior cultures clashed.

Mochiunji's Siege and Final Days: Suicide at Eian Temple

Uesugi Norizane's forces, reinforced by bakufu troops, defeated Mochiunji's army in successive engagements. Mochiunji's retainers, yielding to bakufu pressure, dispersed, and Mochiunji rapidly became isolated. In the second month of Eikyo 11 (1439), cornered at Eian Temple in Kamakura, Mochiunji took Buddhist vows and assumed the religious name "Doukei" before subsequently committing suicide. He was forty-two years old.

Mochiunji's young sons, Yasuo Maru and Haruo Maru, escaped, but in the following year, Eikyo 12 (1440), the last resistance of his former retainers, who had taken refuge in the castle of the Yuuki clan (in Ibaraki Prefecture), became known as the "Yuuki Campaign." Bakufu forces captured Yuuki Castle, and Yasuo Maru and Haruo Maru were taken prisoner and executed. The Mochiunji line appeared to end here, but later Ashikaga Shigeuji, another of Mochiunji's descendants, would be restored to the position of Kamakura kubō.

The Historical Significance of the Eikyo Disturbance: From the Kyotoku Disturbance to Sengoku Kanto

Although the Eikyo Disturbance appeared to end in bakufu victory, subsequent history shows that the difficulty of controlling Kanto was not resolved. Mochiunji's son, Ashikaga Shigeuji, later returned to the position of Kamakura kubō and in Kyotoku 3 (1455) instigated the "Kyotoku Disturbance" by assassinating Kanto Kanrei Uesugi Noriichi. This disturbance lasted more than thirty years in parallel with the Onin War (1467), marking the beginning of the Sengoku (Warring States) period in Kanto. The Eikyo Disturbance was its direct trigger and the starting point of political turmoil in eastern Japan centered on Kamakura.

From the perspective of sword history, the mid-Muromachi period to which the Eikyo Disturbance belonged was a transitional period in which the shape of Japanese swords underwent significant change. As the shift from the long tachi of the Northern and Southern Courts period to the uchigatana of the Muromachi period progressed, Kanto warriors carried swords adapted to the times while seeking to preserve their region's distinctive warrior culture. The sword Mochiunji held at his end—whatever it may have been—symbolized the pride of the Kamakura府, a semi-independent regime, and resistance to the bakufu's centralization of power.

For a warrior, the sword on which one stakes one's life is not merely a weapon, but the embodiment of that person's very way of life. The Eikyo Disturbance, as such a tale of the warrior's spirit, stands deeply inscribed in the history of the Japanese sword alongside the rough nie of Soshu blades.

The Ashikaga School and Uesugi Norizane: The Cultural Heritage of a Scholar-Warrior

Uesugi Norizane, who participated in the bakufu-backed subjugation of Mochiunji in the Eikyo Disturbance, was not merely a military commander but also an important figure in Japanese cultural history. In Eikyo 12 (1440), Norizane restored the Ashikaga School, which had long existed in Ashikaga City in Shimotsuke Province (present-day Tochigi Prefecture), and developed it into Japan's oldest comprehensive educational institution. The Ashikaga School became known as the "Kanto University," and students gathered from throughout the country to study Confucianism, military science, medicine, and the Book of Changes.

After the Eikyo Disturbance, Kanto's political situation remained unstable, but the Ashikaga School alone persisted as a "sacred center of learning," removed from political turmoil. Norizane's figure—carrying the sword, the symbol of martial prowess, while simultaneously dedicating himself to the promotion of learning—embodied the ideal of bunbu ryodo (harmony of culture and martial prowess) in Japanese warrior culture. Later, the concept of "the warrior who is a scholar, the scholar who is a warrior" would become central to Edo-period bushido ideology.

The essence of the Eikyo Disturbance lay in the collision between two paths: Mochiunji's pursuit of "Kanto's independence through martial strength" and Norizane's vision of "rule combining culture and martial prowess." The silence of Eian Temple where Mochiunji took his own life, and the scent of books in the Ashikaga School that Norizane restored—in the same Kanto of the same era, utterly different ideals of the warrior existed together, and clashed. In the history that swords tell, the Eikyo Disturbance is positioned as one of the eras most clearly inscribed with the eternal theme of conflict between martial prowess and culture.