It should be noted that some documents define the Ninmyo-Heishi as 'the clan originating with the descendants of Imperial Prince Motoyasu, a son of Emperor Ninmyo, who were given the surname of 'Taira no Ason' upon being demoted from the Imperial family.'
なお「仁明天皇の皇子・本康親王の子孫が「平朝臣」を賜姓されて臣籍に下ることによって成立した氏族」を仁明平氏と定義している文献もある。