When Ieyasu TOKUGAWA, who claimed to be a descendant of the Serata/Tokugawa clan of the Nitta clan, became the ruler of Kanto region, he hired the head of the Iwamatsu clan, Morizumi IWAMATSU, and requested him to submit his family tree of the Nitta clan.
新田一族の世良田氏・得川氏の後裔と称する徳川家康が関東に入部したとき、岩松氏の当主岩松守純が召し出されて新田氏の系図を求められた。