In addition, like the 15 Chikugo castles under the rule of the Otomo clan, some fell under the control of, but not necessarily becoming the vassal of a more powerful daimyo during the Sengoku Period, and maintained independence like a daimyo with management of the territory, while being militarily submissive.
また、大友氏の支配下にあった筑後十五城のように、家臣ではないがより勢力の強大な戦国大名の幕下に入り、領国経営では大名のような独立性を保ちながら、軍事的に服属する例もあった。