It is thought that strong Kawachi Dynasty were built by holding the maritime power of the Seto Inland Sea and having the cooperation of the Katsuragi clan, an influential local ruling family in the southeast part of Nara basin.
河内王朝は、瀬戸内海の海上権を握ったことと奈良盆地東南部の有力豪族葛城氏の協力を得たことが強大な河内王朝をつくったと考えられる。