The Great Schism By Moedingstpats Mar 27, 1378 Pope Gregory XI Apr 8, 1378 Pope Urban VI Period: Apr 8, 1378 to Oct 15, 1389 Pope Urban VI (Rome) Sep 20, 1378 Antipope Clement VII of (Avignon) Period: Sep 20, 1378 to Sep 16, 1394 Antipope Clement VII (Avignon) Nov 12, 1378 Beginning of the Great Western Schism Nov 2, 1389 Pope Boniface IX Period: Nov 2, 1389 to Oct 1, 1404 Pope Boniface IX (Rome) Sep 20, 1394 Antipope Benedict XIII of (Avignon) Period: Sep 28, 1394 to May 23, 1423 Antipope Benedict XIII of (Avignon) Oct 17, 1404 Pope Innocent VII Period: Oct 17, 1404 to Nov 6, 1406 Pope Innocent VII (Rome) Nov 30, 1406 Pope Gregory XII (Rome) Period: Nov 30, 1406 to Jul 4, 1415 Pope Gregory XII (Rome) Jun 26, 1409 Antipope Alexander V of (pisa) Period: Jun 26, 1409 to May 3, 1410 Antipope Alexander V of (pisa) Nov 15, 1410 Antipope John XXIII of (Pisa) Period: Nov 15, 1410 to Dec 30, 1415 Antipope John XXIII of (Pisa) Period: Nov 12, 1414 to Nov 12, 1418 Council of Constance Nov 12, 1418 Ending of the Great Western Schism