However, in March, 757, when Funado no Okimi was deposed because Empress Koken was displeased with him, Oi no Okimi, backed up by Nakamaro, was installed as the Crown Prince in May.
しかし，翌天平宝字元年（757年）3月、道祖王が孝謙天皇の不興を受けたため廃太子となると、5月に仲麻呂が推す大炊王が立太子された。