Further to those own domains, Masamune also took control of those local ruling families in Southern Mutsu Province area such as Shirakawa Yuki clan, and the ruling families of today's Miyagi Prefecture to Iwate Prefecture area such as Osaki clan and Kasai clan.
これに加え上述の白河結城氏といった南陸奥の諸豪族や、また今の宮城県や岩手県の一部を支配していた大崎氏・葛西氏も政宗の勢力下にあった。