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* ''Birth: [[1521]]''
* ''Death: [[1576]]''
* ''Distinction: Lord of Shimabara''
* ''Title: Shûri-taiyû''
Yoshisada was a son of [[Arima Haruzumi]]. He ruled the Shimabara area of [[Hizen province|Hizen]] but was steadily weakened in wars with the [[Ryuzoji clan|Ryûzôji]]. He was defeated by [[Ryuzoji Takanobu|Ryûzôji Takanobu]] in [[1563]] and in [[1570]] sent troops to assist the [[Otomo clan|Ôtomo]] in their own struggle with Takanobu (which culminated in the [[Battle of Iyama]]). He retired in [[1571]] in favor of his younger brother Arima Harunobu|Harunobu]].
[[Category:Samurai]]
[[Category:Sengoku Period]]