For Iemitsu, Masamune was a person of ability, a tutelage to bring him up and support to be a shogun, and a leading figure in the period of warring states even competed against his grandfather, Ieyasu.
政宗本人の器量に加え、自らを将軍として立ててくれた後見人であり、また敬神する祖父・家康とも渡り合った戦国の雄でもあった。、