It is generally believed that the Minamoto clan ruled the Togoku (the eastern part of Japan, particularly the Kanto region), while the Taira clan held power in the Saigoku (the western part of Japan, particularly Kyushu but ranging as far east as Kinki), but members of the Taira clan could also be found in the Togoku as well.
一般的に「東国の源氏、西国の平氏」と言われるが、東国に平氏が全くいなかったわけではない。