Shinzei was offered the rank of Sojo (high-ranking Buddhist priest) in the year 856 but he declined and his master Kukai was posthumously granted the rank of Daisojo (highest rank of the Buddhist priesthood).
856年（斉衡3年）僧正に任じられたが真済はこれを辞退し、師である空海に大僧正が追贈された。