Roman Catholic Church A church father known for his constant fight against perceived heresies; a saint and Doctor of the Church (329-391).

synonyms: Gregory Nazianzen, Gregory of Nazianzen, St. Gregory of Nazianzen.

Italian pope from 1831 to 1846; conservative in politics and theology; worked to propagate Catholicism in England and the United States (1765-1846).

synonyms: Bartolomeo Alberto Capillari, Gregory XVI.

The pope who sponsored the introduction of the modern calendar (1572-1585).

synonyms: Gregory XIII, Ugo Buoncompagni.

Polish: Grzegorz XIII

The Italian pope from 1406 to 1415 who worked to end the Great Schism and who retired to make it possible (1327-1417).

synonyms: Angelo Correr, Gregory XII.

The Italian pope who fought to establish the supremacy of the pope over the Roman Catholic Church and the supremacy of the church over the state (1020-1085).

synonyms: Gregory VII, Hildebrand.

Roman Catholic Church An Italian pope distinguished for his spiritual and temporal leadership; a saint and Doctor of the Church (540?-604).

synonyms: Gregory I, Gregory the Great, Saint Gregory I, St. Gregory I.

Polish: Grzegorz I, Grzegorz I Wielki