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Pope Gregory XI dies on March 27, 1378, in Rome, just over a year after he had moved the papal court back to Rome from Avignon. His death was followed by the election of Pope Urban VI on April 8, 1378 but a subsequent dispute over the legitimacy of this election led to the Western Schism with the election on September 20, 1378 of Clement VII as a rival pope in Avignon by a majority of the cardinals seceding from Rome.