In Catholicism, a Doctor of the Church (Latin doctor, teacher, from Latin docere, to teach) is a saint from whose writings the whole Christian Church is held to have derived great advantage and to whom "eminent learning" and "great sanctity" have been attributed by a proclamation of a pope or of an ecumenical council. This honor is given rarely, only posthumously, and only after canonization. No ecumenical council has yet exercised the prerogative of proclaiming a Doctor of the Church.