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Harunobu was the daimyô of the [[Arima clan]], a small family that controlled the Shimabara area of [[Hizen province]]. [[Arima Yoshisada|Arima Yoshisada's]] son and successor, Harunobu began a persecution of the Christians in his domain after his father's death. In [[1579]], with [[Ryuzoji Takanobu|Ryûzôji Takanobu]] expanding into the area, Harunobu - like his uncle [[Omura Sumitada|Ômura Sumitada]] - turned to the Jesuits for assistance. In return, he was baptized as Protasio and ended the persecution. The arrival of Portuguese weapons and ships bought the Arima a little time, but in [[1582]] Harunobu lost his important [[Shimabara castle|Shimabara Castle]] and was reduced to holding a thin strip of the peninsula. In desperation, he turned to the [[Shimazu clan]], presently at war with the [[Ryuzoji clan|Ryûzôji in [[Higo province]]. The Shimazu dispatched a force under [[Shimazu Iehisa]] to Shimabara and in [[1584]] they and the [[Arima clan|Arima]], with a combined 3,000 men, defeated the much larger Ryûzôji army at [[Battle of Okitanawate|Okitanawate]], a battle in which Takanobu was killed. Afterwards Shimazu Yoshihisa suggested the Arima renounce Christianity but did not press the issue when Harunobu declined.  

Harunobu was the daimyô of the [[Arima clan]], a small family that controlled the Shimabara area of [[Hizen province]]. [[Arima Yoshisada|Arima Yoshisada's]] son and successor, Harunobu began a persecution of the Christians in his domain after his father's death. In [[1579]], with [[Ryuzoji Takanobu|Ryûzôji Takanobu]] expanding into the area, Harunobu - like his uncle [[Omura Sumitada|Ômura Sumitada]] - turned to the Jesuits for assistance. In return, he was baptized as Protasio and ended the persecution. The arrival of Portuguese weapons and ships bought the Arima a little time, but in [[1582]] Harunobu lost his important [[Shimabara castle|Shimabara Castle]] and was reduced to holding a thin strip of the peninsula. In desperation, he turned to the [[Shimazu clan]], presently at war with the [[Ryuzoji clan|Ryûzôji in [[Higo province]]. The Shimazu dispatched a force under [[Shimazu Iehisa]] to Shimabara and in [[1584]] they and the [[Arima clan|Arima]], with a combined 3,000 men, defeated the much larger Ryûzôji army at [[Battle of Okitanawate|Okitanawate]], a battle in which Takanobu was killed. Afterwards Shimazu Yoshihisa suggested the Arima renounce Christianity but did not press the issue when Harunobu declined.  

Arima attached himself to [[Toyotomi Hideyoshi]] after the latter invaded Kyushu ([[1587]]) and in [[1593]] led some 2,000 men to Korea under [[Konishi Yukinaga]]. Harunobu supported the Western side in the [[Sekigahara Campaign]] ([[1600]]) but did not suffer the loss of any land as a result.  

Arima attached himself to [[Toyotomi Hideyoshi]] after the latter invaded Kyushu ([[1587]]) and in [[1593]] led some 2,000 men to [[Korean Invasions|Korea]] under [[Konishi Yukinaga]]. Harunobu supported the Western side in the [[Sekigahara Campaign]] ([[1600]]) but did not suffer the loss of any land as a result.  

In [[1609]] Harunobu was sent on an expedition to Formosa (Taiwan) with the intention of scouting out a potential trade center for Japanese, Chinese, and Western ships. When they arrived, the island's inhabitants set upon Arima's men and a fair number of them were killed. (The next attempt to conquer this island, in [[1616]] and evidently led by the Ômura, also ended in failure).  

In [[1609]] Harunobu was sent on an expedition to Formosa (Taiwan) with the intention of scouting out a potential trade center for Japanese, Chinese, and Western ships. When they arrived, the island's inhabitants set upon Arima's men and a fair number of them were killed. (The next attempt to conquer this island, in [[1616]] and evidently led by the Ômura, also ended in failure).