After Emperor Saga's side won as a result of the Kusuko Incident in 810, Emperor Saga dedicated his daughter Imperial Princess Uchiko as Saio, as he had pledged; that is probably the beginning of Kamo no Saiin.
そして弘仁元年（810年）薬子の変で嵯峨天皇側が勝利した後、誓いどおりに娘の有智子内親王を斎王としたのが賀茂斎院の始まりであると言われる。