Murakami clan (the Murakami navy) that spread its influence after the Hogen Disturbance to the Sengoku period (Japan) in the Seto Inland Sea area from Shiaku Islands in the east through Kamiseki Town, Suo Province in the west.
保元の乱後から戦国時代(日本)まで東は塩飽諸島から西は周防国上関町まで瀬戸内を勢力圏とした村上氏（村上水軍）。