Reunification of the Northern and Southern Courts (Edict of Meioku)—The End of Strife Embodied in the Japanese Sword

The Reunification of the Northern and Southern Courts (nanboku-chōgattai)—formally known as the Edict of Meioku (Meioku no Woyaku)—was the event on the 5th day of the 10th lunar month of 1392 (Meioku 3) when, through the mediation of Ashikaga Yoshimitsu, the third shogun of the Muromachi bakufu, Emperor Gokameyama of the Southern Court ceded the Three Imperial Regalia to Emperor Gokomatsu of the Northern Court, ending the 56-year division of the Northern and Southern Courts. This reunification marked an important turning point in the history of the Japanese sword. The explosively increased volume of sword production and diversification of forms throughout the turmoil of the Northern and Southern Courts (1336–1392) would transition into a new phase with the Muromachi period following the reunification.

The Circumstances of the Northern and Southern Courts Division and 56 Years of Turmoil

The division of the Northern and Southern Courts began in 1336 (Engen 1) when Ashikaga Takauji rebelled against Emperor Godaigo's Kenmu Restoration. At the Battle of Minato River (1336), Kusunoki Masashige was defeated and killed; Takauji then occupied Kyoto and installed Emperor Kōmyō of the Northern Court. Emperor Godaigo fled to Yoshino (Nara) and established the Southern Court, claiming that the Three Imperial Regalia were held by the Southern Court. Thereafter, turmoil in which the Northern Court (Muromachi bakufu) and Southern Court repeatedly attacked each other alternately continued for more than half a century. Following complex circumstances including the Unification of Shōhei (1351), the Kan'ō Disturbance of Shōhei 6 (1351), and the Southern Court's surprise capture of the Regalia in Shōhei 23 (1368), reunification was ultimately realized through Yoshimitsu's political acumen.

Ashikaga Yoshimitsu's Diplomacy—The Cession of the Three Imperial Regalia and the Southern Court's Return to Kyoto

In negotiations with the Southern Court, Ashikaga Yoshimitsu presented conditions including the Alternating Accession of Both Courts (Ryōtōu Tetsuritsu)—in which the Northern and Southern Courts would alternate in producing emperors—the granting of kokuga-ryō lands to the Southern Court, and the cession of the Three Imperial Regalia. On the 5th day of the 10th lunar month of Meioku 3, Emperor Gokameyama, bearing the Three Imperial Regalia, traveled in state to the palace of the Northern Court and handed the Regalia over to Emperor Gokomatsu. Thus, after 56 years, the imperial court became one, and the era of the Northern and Southern Courts nominally came to an end. In reality, however, Yoshimitsu did not honor his promise of Alternating Accession, and imperial succession remained with the Northern Court lineage. Disappointed by Yoshimitsu's lack of sincerity, Emperor Gokameyama returned to Yoshino and declared the 're-establishment of the Southern Court' in 1410 (Ōei 17), and resistance from Southern Court factions continued sporadically thereafter.

The Japanese Sword and Sword Culture of the Northern and Southern Courts Period—Transformation After Reunification

The reunification had a major impact on sword history. During the intense 56-year period of turmoil, swordsmiths throughout Japan mass-produced large, practical blades to meet battlefield demands. The ōdachi and nodachi of the Northern and Southern Courts period, which exceeded 90–120 cm in length, speaks to the intensity of warfare in this age. In addition to the major production centers of Bizen, Yamashiro, and Yamato, the Sōshū tradition (stemming from Masamune's line) spread to swordsmiths nationwide, giving rise to syncretic styles such as 'Sōshū-tradition Bizen work' (Sōshū-den Bizen-mono) and 'Sōshū-tradition Yamato work' (Sōshū-den Yamato-mono) in each region. In the Muromachi period following reunification (from the Ōei era onward), as warfare subsided, the forms of blades changed once again. A gradual return began from large ōdachi to more portable mid-sized tachi and uchigatana, and blades came to be valued once more for their artistic and ceremonial significance alongside their practical utility as weapons.

The Higashiyama Gobutsu and Ashikaga Yoshimitsu—The Establishment of Sword Appreciation Culture

Backed by his immense power, Ashikaga Yoshimitsu initiated Sino-Japanese trade with Ming China and accumulated vast wealth. This wealth was invested in cultural endeavors, and Yoshimitsu refined the culture of sword appreciation alongside noh drama, linked-verse poetry, ink-wash painting, and the tea ceremony. The swords and art objects that Yoshimitsu collected became a precursor to the Higashiyama Gobutsu (Higashiyama Collection), symbolizing the cultural authority of the later Ashikaga shogunal house. Yoshimitsu actively employed swords not merely as military equipment but as instruments of gift-giving, diplomacy, and authority display. Japanese swords were also used as important gifts in the mission to Ming China in 1401, and the recognition of the Japanese sword's international value was established in this era. The 'Age of Yoshimitsu' following the reunification of the Northern and Southern Courts represented an important turning point when blades underwent a metamorphosis from weapons into artworks and cultural treasures.

The Historical Significance of Northern and Southern Courts Reunification—The Spirit of the Age Embodied in the Japanese Sword

The 56-year turmoil of the Northern and Southern Courts period was the age that brought the most dramatic changes to the form, technique, and spiritual culture of the Japanese sword. The series of developments—the flourishing of the ōdachi, the nationwide diffusion of the Sōshū tradition, the establishment of Bizen's mass-production system, and the flourishing of sword appreciation culture after reunification—overlaps with the process by which the Japanese sword transcended its status as a mere weapon to become a special entity possessing the complex values of 'the soul of the warrior,' 'artwork,' and 'sacred object.' After the Edict of Meioku brought warfare to a close and Yoshimitsu's Muromachi bakufu entered a period of stability, the cultural practices of sword appreciation, sword gift-giving, and sword dedication became established as formal etiquette in samurai society. The direct source of the present culture of sword authentication, preservation, and display lies in the cultural soil that formed in the Muromachi period following the reunification of the Northern and Southern Courts. The reunification of the Northern and Southern Courts, as a political event, can be understood in sword history as well as an important historical juncture marking 'the turning point from the age of weapons to the age of culture.'

The Rump Southern Court and Sword Succession—The Final Struggle Over the Three Imperial Regalia

Even after the Edict of Meioku, resistance from Southern Court descendants continued sporadically. The 'Rump Southern Court' (Gonanchō), based on the descendants of Emperor Gokameyama, continued to claim legitimacy with Yoshino and Kōya (Mount Kōya) as strongholds from the Ōei era onward. In 1443 (Kakitsu 3), the 'Incident at the Imperial Palace' (Kinkoku no Hen) occurred, when Southern Court faction warriors stormed the palace and seized the sword and jewel among the Three Imperial Regalia. While the jewel (shinji) was recovered by Akamatsu loyalists in 1458 (Chōroku 2), the whereabouts of the sword (the Kusanagi or more precisely its form-substitute) remained unknown for a long time. This incident demonstrates that the Three Imperial Regalia possessed special spiritual value beyond their role as political symbols, functioning as 'sacred blades' connected to the Japanese sword tradition. The notion that blades are at once weapons, artworks, and 'sacred objects' became inscribed more deeply into the Japanese spirit through the turmoil of the Northern and Southern Courts and the subsequent resistance of the Rump Southern Court. While the Edict of Meioku, which realized the reunification of the Northern and Southern Courts, marked a provisional settlement of this 'struggle over the Regalia,' the later resistance of the Rump Southern Court prevented a definitive conclusion. From the perspective of sword history, the resistance of the Rump Southern Court that continued after the reunification demonstrates that the Japanese sword's 'symbolic and sacred value' retained powerful centripetal force even in political contexts. The movements of the Rump Southern Court, exemplified by the Incident at the Imperial Palace (1443), constitute precious historical testimony that Japan's unique spiritual culture—in which blades and sacred objects were unified—functioned as a living political reality even in the Muromachi period.

Muromachi Seals and Blades—The Diplomatic Function of Swords in the Yoshimitsu Era

From the 1390s when Ashikaga Yoshimitsu achieved the reunification of the Northern and Southern Courts through his death in 1408, the Japanese sword played an important diplomatic role in relations with Ming China. In 1401 (Ōei 8), Yoshimitsu sent an envoy to the Yongle Emperor of Ming, assuming the title 'King of Japan,' and initiated the Sino-Japanese trade under the tallies system (kangō bōeki). In this mission, Japanese swords served as one of the principal tribute items and were highly valued at the Ming court. Ming records contain praise for the sharpness and beauty of the 'Japanese sword' (wakitō), and the international reputation of the Japanese sword was established and reinforced through the diplomacy of Yoshimitsu's era. It was also during this period that surplus Japanese swords mass-produced through the turmoil of the Northern and Southern Courts began to circulate in the international market as diplomatic gifts and trade goods. The stability achieved through the Edict of Meioku and the Sino-Japanese trade established under Yoshimitsu's powerful leadership became an important impetus for positioning the Japanese sword as a 'world commodity' in the international market. The fact that a domestic political event like the reunification of the Northern and Southern Courts contributed to sword history in the unexpected form of the Japanese sword's international evaluation and circulation provides an intriguing perspective for multifaceted understanding of this era.