n. (Roman Catholic Church) a church father known for his constant fight against perceived heresies; a saint and Doctor of the Church (329-391)
n. Italian pope from 1831 to 1846; conservative in politics and theology; worked to propagate Catholicism in England and the United States (1765-1846)
n. the pope who sponsored the introduction of the modern calendar (1572-1585)
n. 格雷戈里（男子名, 古代罗马教皇之名）