After political power was united into, three Miyake, Katsuranomiya, Arisugawanomiya, and Kaninnomiya were established one after another, these are called 'the Four Imperial families' including Fushiminomiya.
統一政権の成立とともに、桂宮、有栖川宮、閑院宮の3家が相次いで創設され、伏見宮とあわせて、この4つの世襲親王家を「四親王家」と呼ぶ。