In medieval times they were localized in Oshu as retainers of the KASAI clan; the three family lines rose and fell alternately, had conflicts with neighboring forces and spawned many branch families.
中世には葛西氏の家臣となって奥州に土着し、三つの家系が交互に興亡して近隣の諸勢力と抗争しつつ、多くの分家庶流を生んで繁茂した。