Sadayo IMAGAWA was a busho (Japanese military commander), shugo daimyo (shugo, which were Japanese provincial military governors, that became daimyo, which were Japanese feudal lords) in Totomi Province, Kyushu Tandai (local commissioner) of the Muromachi bakufu (Japanese feudal government headed by a shogun), lived from the late Kamakura period, the period of the Northern and Southern Courts (Japan), until the Muromachi period.
今川貞世（いまがわさだよ）は、鎌倉時代後期から南北朝時代(日本)・室町時代の武将、遠江国の守護大名、室町幕府の九州探題。