Arima Naozumi

Arima Naozumi
Arima family head
In office 1612–1641
Preceded by	Arima Harunobu
Succeeded by	Arima Yasuzumi
Lord of Shimabara
In office 1612–1614
Preceded by	Arima Harunobu
Succeeded by	Matsukura Shigemasa
Personal details
Born	1586 Japan
Died	June 3, 1641
Nationality	Japanese

Arima Naozumi (Japanese: 有馬 直純; 1586 – June 3, 1641) was the first son of the Kirishitan daimyo Arima Harunobu. He was baptized as a child with the name Miguel (ミゲル). He was born in Hinoe Castle in Shimabara but was sent by his father to work beside Tokugawa Ieyasu at the age of 15. He married Konishi Yukinaga's niece Marta (マルタ); however, in order to curry favor with Ieyasu, he divorced his Christian wife and married Ieyasu's adopted daughter Kuni-hime in 1610. In 1612, he inherited his father's land valued at 40,000 koku in Shimabara when his father was executed for his role in the Okamoto Daihachi Incident. Tokugawa Ieyasu ordered a general persecution of all Christians in Japan, and Naozumi immediately gave up his Christian belief, exiled his former wife and secretly killed his two half brothers: 8-year old Francisco (フランシスコ) and 6-year old Mathias (マティアス).

However, he was dissatisfied with the constant revolts and chaos as a result of the Christian persecution and asked the Shogunate to transfer him to Nobeoka in Hyuga Province. When the Shimabara Rebellion broke out in his old fief in 1637, he answered the call of the Shogunate and led a detachment of 4000 troops to suppress the rebellion. He died in 1641, during his sankin kotai in Osaka.