Because the genealogies which seem to have been made between the late Heian period and the early Kamakura period are extant, it is considered that such well-organized 'genealogies of The Tale of Genji' were already created during the insei period (the period of the government by the Retired Emperor).
平安時代末期から鎌倉時代初期にかけて作成されたと見られるものが現存しているため、このような「源氏物語系図」は院政期にはすでにまとまったものが作成されたと考えられている。