Usami Sadamitsu (宇佐美定満 ) also known as Usami Sadayuki (宇佐美定行) (1489 – August 11, 1564) was a Japanese samurai of the Sengoku period, who served the Uesugi clan of Echigo Province.
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The original article can be found at Usami Sadamitsu and the edit history here.