The palaces of shogun, his heir and ogosho (ex-shogun) were constructed the central castle compound of the Edo Castle within the Honmaru, Ninomaru and Nishinomaru interior castle that were enclosed by the Ote-mon, Wadakura-mon, Babasaki-mon, and Sakurada-mon cates, and the residences of Tokugawa gosanke (three privileged branches of the Tokugawa family) were reserved west of the Castle and behind Hanzo-mon gate Gate.
つまり、江戸城の本城は大手門から和田倉門、馬場先門、桜田門の内側にある本丸、二の丸、西の丸などの内郭に将軍、次期将軍となる将軍の世子、先代の将軍である大御所が住む御殿が造られ、その西にあたる半蔵門内の吹上に将軍の親族である徳川御三家の屋敷が置かれた。