The person who was placed in the most highest position among the Naishi no suke and controlled the court ladies was called osuke, and controlled all of the various matters of Otsune Goten Palace in Gosho (imperial palace) along with the Koto naishi no jo (clerical worker at government offices, also called nagahashi no tsubone since lived in a corridor from Seiryoden to Shishinden.)
その典侍の中でも最上位に位置し、女官を統括する者は大典侍と称し、匂当掌侍（長橋局）と並んで御所御常御殿の事務諸事一切を掌握した。