Gregory X, d. 1276, pope (1271–76), an Italian named Tebaldo Visconti, b. Piacenza; successor of Clement IV. After Clement IV's death the cardinals took 34 months to elect a pope. Gregory was archdeacon of Liège when elected and neither a cardinal nor a priest. At the time he was in the Holy Land. He became a conciliator in European politics and helped to end civil war in Germany by supporting the election of Rudolf of Hapsburg as emperor (see Rudolf I). He convoked the Second Council of Lyons (1274; see Lyons, Second Council of) and led in its work, particularly in the temporary reunion with the Orthodox of Constantinople. He was succeeded by Innocent V. Gregory was beatified in 1713.
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