To indicate the legitimacy of the Nitta clan, which was considered as the ancestors of the Tokugawa clan, Mitsukuni TOKUGAWA claimed in "Dainihonshi" (Great Japanese History) that the Nancho was the legitimate line.
徳川光圀は徳川氏の祖とされた新田氏の正統性を示すため、「大日本史」で南朝(日本)を正統であると提示した。