Regarding his origin, the genealogy of 'Prince Otomo-Yota-no-okimi (family name was Otomo)-Totomumaro-Kuronushi' was described in "Honcho koin jounroku" (the Emperor's family tree, made in the Muromachi period).
出自に関して、『本朝皇胤紹運録』に「大友皇子─与多王（大友賜姓）─都堵牟麿─黒主」と系図を掲げる。