島原之亂
, often romanized as Shirou, was a Japanese Christian of the Edo period and leader of the Shimabara Rebellion, an uprising of Japanese Roman Catholics against the Shogunate. His "imina" is Tokisada (時貞) and he is also known as Masuda Shirō (益田 四郎). His Christian name was Geronimo, however, he later changed it to Francisco.