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Gregory XI, the last Avignon pope, entered Rome after a four-month journey from Avignon, returning the papacy to its original city.

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Pope Gregory XI
Head of the Catholic Church from 1370 to 1378
Pope Gregory XI was head of the Catholic Church from 30 December 1370 to his death, in March 1378. He was the seventh and last Avignon pope and the most recent French pope. In 1377, Gregory XI returned the papal court to Rome, ending nearly 70 years of papal residency in…Source: Wikipedia (CC BY-SA)
Avignon Papacy
Period during which the Pope lived in Avignon, France (1309–1376)
The Avignon Papacy was the period from 1309 to 1376 during which seven successive popes resided in Avignon rather than in Rome. The situation arose from the conflict between the papacy and the French crown, culminating in the death of Pope Boniface VIII after his arrest and…Source: Wikipedia (CC BY-SA)
Avignon
Prefecture of Vaucluse, Provence-Alpes-Côte d'Azur, France
Avignon is the prefecture of the Vaucluse department in the Provence-Alpes-Côte d'Azur region of southeastern France. Located on the left bank of the river Rhône, the commune had a population of 93,671 as of the census results of 2017, with about 16,000 living in the ancient…Source: Wikipedia (CC BY-SA)