In spite of King Wakatakeru's efforts, the royal line weakened between the late fifth century and the beginning of the sixth century; some widely accepted theories claim that the line ended several times.
そうしたワカタケル王の努力に関わらず5世紀後半から6世紀前半にかけて王統が弱体化し、数回断絶したとの説も有力である。