The repetition of an ordination to the priesthood which has been conferred either extra ecclesiam, i.e. by a heretical or schismatic bishop, or intra ecclesiam but not canonically, e.g. by a deposed or simoniacal bishop. Though a matter of controversy from the 3rd cent., reordination was often practised before the 12th cent., when the doctrine of the sacraments began to receive more precise formulation. According to Catholic theology the sacrament of Orders is held to confer on the recipient an indelible character, provided that it is conferred in the prescribed form and with the right intention. The Greek Church repudiated reordination at the Trullan Synod (692), but has continued to waver in its practice.