was an armed struggle between the Ainu and Wajin that took place on the

Oshima Peninsula The Oshima Peninsula (渡島半島 ''Oshima-hantō'') is the southernmost part of Hokkaidō, the northernmost of the Japanese islands. Where the peninsula starts is open to interpretation. A more generous interpretation is to draw a line southea ...

of southern Hokkaidō, Japan, in 1457. Escalating out of a dispute over the purchase of a sword, Koshamain and his followers sacked , before being overcome by superior forces under

Takeda Nobuhiro Takeda Nobuhiro (武田信広), also known as Kakizaki Nobuhiro (蠣崎信廣) (1431 – 1494) was the ancestor of the Matsumae clan, and is celebrated for his role in suppressing the 1457 Ainu revolt of Koshamain. The adopted son of Takeda ...

. The principal record of the conflict is ''

Shinra no Kiroku or "Record of Shinra" is an early-Edo period Japanese domainal history. The chronicle is also known as or . It was compiled in 1643 by , the sixth son of Matsumae Yoshihiro, first daimyō of the . Its two scrolls recount the early history of the ...

''.

References

{{Reflist Ainu history History of Hokkaido Conflicts in 1457 15th century in Japan

See also

References