Nectarius, about this period, abolished the office of the presbyter whose duty it was to preside over the imposition of penance; and this is the first instance of the suppression of this office in the Church.
Christianity · Church History · Ecclesiastical History
Book VII, Ch. 16 — In What Manner, and from What Cause, the Functions of the Presbyter, Appointed to Preside over the Imposition of Penance, were abolished. Dissertation on the Mode of Imposing Penance.
Ecclesiastical History · Salminius Hermias Sozomen