In 819, the fixed number of Sogosho was determined as one Sojo, one Daisozu (the highest grade that can be held by one who has reached the second highest rank in the hierarchy of Buddhist priests), one Shosozu (the lower grade Buddhist priests of Sozu) and four Risshi.
819年には僧綱所の定員が僧正1名、大僧都1名、小僧都1名、律師4名と定められた。