Person

Koshamain

d. 1457 · 15th century

Koshamain was an Ainu chief who led an uprising against Japanese traders and settlers in southern Hokkaido in 1457, after a Japanese smith killed an Ainu youth in a quarrel. His forces took most of the Japanese strongholds on the Oshima Peninsula before Takeda Nobuhiro, founder of the line of the later Matsumae clan, killed him.

Koshamain
Image: Almsev · CC BY-SA 3.0 · Wikimedia Commons

Mentioned in 1 state history

Ainu chiefdoms

See also

Cite this entry
APA
The Epoch Institute. (2026). Koshamain. In The Epoch Institute Encyclopedia. https://the-epoch-institute.org/encyclopedia/koshamain
MLA
“Koshamain.” The Epoch Institute Encyclopedia, The Epoch Institute, 2026, https://the-epoch-institute.org/encyclopedia/koshamain. Accessed .
Chicago
The Epoch Institute. “Koshamain.” The Epoch Institute Encyclopedia. 2026. https://the-epoch-institute.org/encyclopedia/koshamain.
Harvard
The Epoch Institute (2026) ‘Koshamain’, The Epoch Institute Encyclopedia. Available at: https://the-epoch-institute.org/encyclopedia/koshamain (Accessed: ).

Last reviewed October 2026Random entry ↻