Great Western Schism By Flip115 1377 Death of Pope Gregory XI 1378 Pope of Rome Urban VI Elected 1378 Antipope Clement VII of Avignon Elected Period: 1378 to 1389 R.Urban VI Period: 1378 to 1394 A.Clement VII 1389 Pope Boniface IX of Rome Elected Period: 1389 to 1404 R.Boniface IX 1394 Antipope Benedict XIII of Avignon Elected Period: 1394 to 1423 A.Benedict XIII 1404 Pope Innocent VII of Rome Elected Period: 1404 to 1406 R.Innocent VII 1406 Pope Gregory XII of Rome Elected Period: 1406 to 1415 R.Gregory XII 1409 Antipope Alexander V of Pisa Elected Period: 1409 to 1410 P.Alexander V 1410 Antipope John XXIII of Pisa Elected Period: 1410 to 1415 P.John XXIII Period: 1414 to 1418 Council of Constance 1417 Pope Martin V of Rome