When the leader of the samurai family who headed the shogunate was appointed "Seii Taishogun," his honorific title of "Uesama" changed into "Kubosama"; the term "Kubo" strongly indicated that "Kubo" was a representative of the Court.
幕府の主宰者たる武家の棟梁は、征夷大将軍を宣下されて後、敬称が上様から公方様に転化することとなり、公方は朝廷の代行者という意味が強かった。