According to this theory, Emperor Tenchi who gave an important position to Kamatari FUJIWARA, ordered him to perpetuate a joint administration system, that is, an assisted government system that permitted the Emperor's family to grip the Imperial Throne and the Fujiwara clan to assist it.
この説によれば、藤原鎌足を重用した天智天皇は、皇位を天皇家が掌握し、天皇家と姻戚関係を持つ藤原氏がこれを輔佐するという共同執政＝輔政体制を代々永続させるように伝えた。