Ryoto tetsuritsu, after unification between the descendants of Emperor Gokomatsu of the Northern Dynasty and Gokameyama of the Southern Dynasty, was included as one of the unification conditions.
合一後は、北朝の後小松天皇の子孫と南朝の後亀山天皇の子孫とのあいだで両統迭立を行うことが、合一の条件に盛り込まれたのである。