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...It is synonymous with the word "Ooyakekata" found in the Tale of Genji and The Pillow Book from the mid-Heian period, and was used to refer to the nobles and the Imperial Court as the opposite of "shi" (private), as seen in the August 1181 (Youwa 1) Komonshomonchushu (Todaiji documents) of Goshirakawa Incho, "Kubou saimono" (Kubou saimonsu) and the August 1256 (Kōgen 1) Kanshin'in Mandokoro Shimobunan (Yasaka Shrine documents) of Kanji. This usage was seen throughout the Middle Ages, but an early example of this was the use of the word "Ooyakekata" to refer to the Shogun in the mid-Kamakura period, when the Shogun's Migiyosho (Shogun's official letter) of 1283 (Kōan 6) was called "Kubou Gokyosho" (Shogun's official letter).

*Some of the terminology explanations that refer to "Oyakekata" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…平安中期の《源氏物語》《枕草子》などにみられる〈おおやけかた〉と同義で，1181年(養和1)8月の後白河院庁公文所問注記集(《東大寺文書》)に〈公方済物〉，1256年(康元1)8月の感神院政所下文案(《八坂神社文書》)に〈公方に訴え申す〉などとあるように，〈私〉の対語として公家，朝廷の方面をさす語であった。この用法は中世を通じても見られるが，鎌倉中期の1283年(弘安6)将軍家御教書（みぎようしよ）を〈公方御教書〉といったのを早い例として，将軍をさす言葉として用いられるようになった。…

※「おおやけかた」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報