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Gregory IX Biography

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GREGORY IX (Ugolino, Count of Segni) (Pope, 1227–41). He followed the policy of Gregory VII and had a long dispute with the Emperor Frederick II (q.v.), whom he twice excommunicated. The Emperor marched upon the papal territories, took Ravenna, and intercepted a fleet from Genoa which was conveying a hundred Church dignitaries to Rome. Gregory died before the trouble was settled. He was active in strengthening the orders of monks and made an attempt to bring the Eastern church into union with Rome. He instituted the Monastic Inquisition and gave it in charge to the Dominicans. For his life, consult: Balan (Modena, 1872–73) ; J. Marx, Die Vita Gregorii IX quellenkritisch untersucht (Berlin, 1890); Felten, Papst Gregor IX (ib., 1886) ; Auvray (ed.), Les registres de Grégoire IX, 1227–35 (Paris, 1890–96). His Epistolæ are in D'Achery, Spicilegium, vol. iii (ib., 1723).

The New International Encyclopaedia, Vol. X (New York: Dodd, Mead & Co., 1920) 355.