Takakage supported the Mori family with his brother Motoharu KIKKAWA and he was called 'Ryosen' (Mori-Ryosen system) and was in charge of the conquest of mainly the Sanyo region.
隆景は兄の吉川元春とともに毛利家を支えて「両川」と呼ばれ（毛利両川体制）、主に山陽地方の経略を担当した。