Pope Gregory XI (c. 1336 – March 27, 1378), born Pierre Roger de Beaufort, Pope from 1370 to 1378, born in Maumont, in the modern commune of Rosiers-d'Égletons, Limousin around 1336, succeeded Pope Urban V (1362–70) in 1370 as one of the Avignon Popes. During his pontificate vigorous measures were taken against the heresies which had broken out in Germany, England, and other parts of Europe; a sincere effort was also made to bring about a ref...