By that time, Masamune territorialized the Nakadori region and Aizu region of today's Fukushima Prefecture, the Southern part of Yamagata Prefecture, and the Southern part of Miyagi Prefecture; Masamune acquired one of the largest areas of domain among other warlords in Japan.
このとき政宗は現在の福島県の中通り地方と会津地方、及び山形県の南部、宮城県の南部を領し全国的にも屈指の領国規模を築いた。