Toshihisa was the 3rd son of [[Shimazu Takahisa]]. A reliable soldier, he fought in a number of his elder brother [[Shimazu Yoshihisa|Yoshihisa's]] campaigns and in [[1580]] was awarded the former domain of the [[Keto-in]] in [[Satsuma province]] as his fief. In [[1592]] he joined those retainers who resisted the call to duty in the [[Korean Campaign]] and committed suicide when his brother [[Shimazu Yoshihiro|Shimazu Yoshihiro's]] forces came to punish them.
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Toshihisa was the 3rd son of [[Shimazu Takahisa]]. A reliable soldier, he fought in a number of his elder brother [[Shimazu Yoshihisa|Yoshihisa's]] campaigns and in [[1580]] was awarded the former domain of the [[Keto-in]] in [[Satsuma province]] as his fief. In [[1592]], when summoned for service in the [[1st Korean Campaign]], he declined, pleading illness. As many of Toshihisa's retainers had recently participated in an armed resistance to service in Korea, Hideyoshi suspected him of also defying his commands and sent Yoshihisa to punish him. Toshihisa committed suicide before Yoshihisa arrived, saying in his death note that while he had not contemplated rebellion, he chose to commit suicide for the sake of the Shimazu house.
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One of Toshihisa's daughters married [[Sata Hisayoshi]] [佐多久慶].