Arima Yoshisada

Arima Yoshisada (有馬義貞) was a Japanese daimyo from Hizen. He lived during the Sengoku period. He was the son and successor of Arima Haruzumi and the father of Kirishitan daimyo Arima Harunobu. He was the 12th head of the Arima clan.

In 1563, Yoshisada formed a partnership with the Portuguese and the Jesuits due to the goods they brought to the domain. In 1576, Yoshisada converted to Christianity, along with some of his subjects. He was given the bapstimal name Don Andre.