It was officially recognized as Daigaku-ryo Nanso (one of the Daigaku-besso located to the south of Daigaku-ryo) in 900, and was called 'Nanso no Niso' (two academies to the south) along with Kangakuin.
900年（昌泰3年）には大学寮南曹として公認され、勧学院と並び「南曹の二窓」と称された。