Koshamain's War

Koshamain's War
Part of the Ainu rebellions

Map of the Twelve Garrisons of Dōnan, 10 of which were captured by the Ainu
Date1457–1458
Location
Oshima Peninsula, Hokkaido, Japan
Result Japanese victory
Belligerents
Kakizaki clan Ainu
Commanders and leaders
Takeda Nobuhiro Koshamain †

Koshamain's War (コシャマインの戦い, Koshamain no tatakai) was an armed struggle between the Ainu and Wajin that took place on the Oshima Peninsula of southern Hokkaidō, Japan, between 1457 and 1458. Escalating out of a dispute over the purchase of a knife, Koshamain and his followers sacked twelve forts in southern Ezo (道南十二館), before being overcome by superior forces under Takeda Nobuhiro. The principal record of the conflict is the Shinra no Kiroku, written in 1646.[1][2] However, as it was written approximately 200 years after the events, historians note that its contents require critical verification. The conflict was a pivotal event in the history of the region, leading to the consolidation of Japanese power and the eventual formation of the Matsumae Domain.

Background

During the 15th century, the Ainu did not possess iron-smelting technology and relied on trade for iron goods. They traded with Ming China and with Japanese settlers who had expanded into the southern Oshima Peninsula (known as the Watari-to or the "Twelve Fortified Residences" area). Following the Tumu Crisis in 1449, Ming China's influence over northern peoples waned, causing Ainu trade with China to decline and their dependence on Wajin trade to increase; the Ainu resentment over territorial invasion and "unfair" Japanese trading ran high during the lead up to the war.[3][4] Concurrently, the political landscape of southern Hokkaido was in flux. The main branch of the Ando clan had been destroyed following the defeat and suicide of Ando Yoshisue — the local lord of Mutsu and Ezo — during conflict with the Nanbu clan, creating a power vacuum in the region.[5]

Course of the war

The conflict was triggered by a dispute in 1456 at Shinori (modern-day Zenigamezawa, Hakodate). An Ainu man, referred to in records as Okkay (likely the Ainu word for "man" or "young man"), ordered a small ritual knife (makiri) from a Wajin blacksmith. A dispute arose regarding the quality and price of the knife. In the ensuing argument, the blacksmith stabbed and killed the Ainu man. While the Shinra no Kiroku uses the term Otsugai (乙孩) to describe the victim, later interpretations and accounts by 17th-century visitors, such as the Italian Jesuit Girolamo de Angelis, suggest the victim may have been a youth.[a][5]

In response to the killing, the Ainu unified under the leadership of the chieftain Koshamain[b]. In May 1457, they launched a wide-scale offensive against Japanese settlements, spanning from Mukawa in the east to Yoichi in the west. The Ainu forces successfully captured 10 of the Twelve Garrisons of Dōnan (道南十二館 (Dōnan Jūni-tate)), the primary defensive outposts of the Wajin settlers. Only two forts, Hanazawa and Mobetsu, remained under Japanese control. In 1458, Takeda Nobuhiro, a retainer of the Hanazawa lord Kakizaki Sueshige, led a counteroffensive. At the battle of Nanaehama, Nobuhiro used a bow to kill both Koshamain and his son. Following the death of their leader, the Ainu forces disintegrated and the uprising was suppressed.[5]

Aftermath and legacy

The conflict marked the beginning of a century of intermittent warfare between the Ainu and Wajin. The victory solidified the position of Takeda Nobuhiro, whose descendants eventually established the Matsumae Domain, which would dominate trade and political relations with the Ainu for centuries. Despite this consolidation, the Ainu continued to resist Japanese expansion, leading to later major uprisings such as Shakushain's revolt in 1669 and the Menashi-Kunashir rebellion in 1789.

Some scholars, such as Nobuo Irumada, suggest that the conflict should be viewed against the backdrop of the power struggle between the Nanbu and Andō clans in the northern Ou region, citing the movements of Andō Masasue, who resided in southern Hokkaido until the year before the incident. Conversely, Masato Kobayashi proposes a theory that frames the war as part of an effort by Takeda Nobuhiro and Shimokuni Iemasa to unify Ezo under their control.[6]

Since 1994, an annual memorial service has been held in early July at Mount Io (Iōzan) in Kaminokuni, Hokkaido, organized by both Ainu and Wajin volunteers to pray for peace. In 2025, for the first time in history, descendants of the Kakizaki clan participated in the ceremony.[7]

See also

Notes

  • 1 On the other hand, various records that have survived at least since the early modern period suggest that the Ainu term okkay refers to men in general, not just young men, and that it is questionable whether children would have been allowed to trade in valuable iron products in the first place.
  • 2 (Also known as Koshamainu or Kosamainu – Japanese: "胡奢魔犬" – other spellings such as "胡奢魔犾", "胡奢麻尹", and "胡奢魔尹" can also be seen.)

References

  1. ^ Shindō Tōru (30 September 2004). コシャマインの戦いに関する『新羅之記録』の史料的検討 [Study on the records about the Koshamain Battle in 'Shinra-no-Kiroku']. 図書館情報メディア研究 (in Japanese). 2 (1). University of Tsukuba. Archived from the original on 14 November 2016. Retrieved 13 November 2016.
  2. ^ Walker, Brett L (2001). The Conquest of Ainu Lands: Ecology and Culture in Japanese Expansion, 1590–1800. University of California Press. p. 27. ISBN 978-0520248342.
  3. ^ Walker, Brett L. (19 September 2001). The Conquest of Ainu Lands: Ecology and Culture in Japanese Expansion, 1590–1800. Berkeley, California: University of California Press. ISBN 9780520227361.
  4. ^ Batten, Bruce L. (28 February 2003). To the Ends of Japan: Premodern Frontiers, Boundaries, and Interactions. Honolulu: University of Hawaii Press. ISBN 9780824865207.
  5. ^ a b c Hirayama, Hiroto (November 2018). アイヌの歴史 縄文から現代までの1万年史 [A History of the Ainu: A 10,000-Year History from the Jomon Period to the Present] (in Japanese) (1st ed.). Tokyo: Akashi Shoten (明石書店). p. 88. ISBN 978-4-7503-4756-1.
  6. ^ 入間田宣夫; 小林真人; 斉藤利男 (1999). 北の内海世界 北奥羽・蝦夷ケ島と地域諸集団 [The World of the Northern Inland Sea: Northern Ou, Ezogashima, and Regional Groups] (in Japanese). Tokyo: 山川出版社 (Yamakawa Shuppansha). ISBN 9784634607507.
  7. ^ アイヌと和人の「コシャマインの戦い」から５６８年、慰霊祭で平和へ祈り…蠣崎氏の子孫が初参列 [568 Years Since the 'Battle of Koshamain' Between the Ainu and the Wajin: Prayers for Peace Offered at Memorial Service—Descendants of the Kakizaki Clan Attend for the First Time]. The Yomiuri Shimbun (in Japanese). 16 July 2025. Retrieved 29 April 2026.
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