In a passage in the 'Shugei Shuchiin-shiki' written when the priest Kukai founded the Shugei Shuchiin school in 829, the 'Nikyo-in' of KIBI no Makibi and Untei-in of ISONOKAMI no Yakatsugu are mentioned as the school's predecessors, with the current state of Untei described as 'having a beginning and unending, abandoned by people, in devastation,' suggesting that it no longer existed in his times.
なお、829年（天長5年）に空海が綜芸種智院を設置した際に書かれた「綜芸種智院式」の文中に、自分の学校の先駆として吉備真備の「二教院」とともに石上宅嗣の「芸亭院」を挙げたうえで、芸亭の現状を「始めありて終りなく、人去って跡あれたり」と記しており、この時には既に消滅していたことが窺える。