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The development of the knowledge of the priests as one who was uniquely empowered and ordained by God to offer sacrifices for the people on the analogy of the Old testament priesthood increasingly tended to demoted the role of laity in Christian worship and ministry. These tendencies were strengthened by the development of the doctrine of transubstantiation beginning in the ninth century and concluding in its official promulgation at the fourth Lateran council in 1215. The fourth Lateran council promoted the doctrine of transubstantiation which raised to that moment in the alteration of substance by which the bread and wine offered in the sacrifice of the sacrament of the Eucharist during the course of the mass become in reality the body and blood of Jesus Christ.
