Around that time, Hideyoshi TOYOTOMI was carrying out the unification process of Japan as a single nation, which he took over from Nobunaga ODA; Masamune strongly opposed to this unification process of Hideyoshi.
この頃、中央では豊臣秀吉が織田信長の統一事業を継承しており、政宗は秀吉と鋭く対立した。