Changes of dynasties theories are doctrines which say, due to the interruption in the imperial line of the Imperial Family in the Kofun period in Japan, dynasties were changed several times.
王朝交替説（おうちょうこうたいせつ）は、日本の古墳時代に天皇家の皇統の断続があり、複数の王朝の交替があったとする学説。