An "elder" or priest, a member of the order of priesthood; the presbyterate is one of the three degrees of the Sacrament of Holy Orders (1536, 1554). Presbyters or priests are co-workers with their bishops and form a unique sacerdotal college or "presbyterium" dedicated to assist their bishops in priestly service to the People of God (1567). Through the ministry of priests, the unique sacrifice of Christ on the cross is made present in the Eucharistic sacrifice of the Church (1554, 1562). See Priesthood.