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From The Collaborative International Dictionary of English v.0.48:
Gregory \Gregory\ prop. n. 1. Pope Gregory XIII., born 1572, died 1585, the pope who introduced the modern calendar. Syn: Gregory XIII, Ugo Buoncompagni. [WordNet 1.5] 2. Pope Gregory I., born circa 540, died 604; the pope for whom Gregorian chants were named. Syn: Gregory I, Saint Gregory I, Gregory the Great. [WordNet 1.5]