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