Sadakiyo was a retainer of Toyotomi Hideyoshi and a son-in-law of Ishida Mitsunari. He was given Inuyama castle in Owari province, as well as being named daikon of the Kiso area of Shinano province. He sided with Ishida during the Sekigahara Campaign (1600) and was present for the half-hearted siege of Tanabe Castle in Tango province. When Tanabe surrendered, Sadakiyo returned to shut himself up in Inuyama. When Mitsunari was defeated shortly afterwards at Sekigahara, Sadakiyo shaved his head, quit Inuyama, and made his way to Kyoto. He is said to have afterwards made a living there as a moneylender.
- Initial text from Sengoku Biographical Dictionary (Samurai-Archives.com) FWSeal & CEWest, 2005