| Year | # | Name | In Opposition To Pope | % Correct |
|---|---|---|---|---|
| 1058-1059 | X | Benedict | Nicholas II | 92%
|
| 1394-1423 | XIII | Benedict | Boniface IX, Innocent VII, Gregory XII, Martin V | 92%
|
| 1424-1430 | XIV | Benedict | Martin V | 92%
|
| 1430-1437 | XIV | Benedict | Martin V | 92%
|
| 844 | VIII | John | Sergius II | 92%
|
| 997-998 | XVI | John | Gregory V | 92%
|
| 1410-1415 | XXIII | John | Gregory XII | 92%
|
| 1409-1410 | V | Alexander | Gregory XII | 77%
|
| 974 | VII | Boniface | Between Benedict VI and Benedict VII | 77%
|
| 984-985 | VII | Boniface | Between John XIV and John XV | 77%
|
| 1080-1100 | III | Clement | Gregory VII, Victor III, Urban II, Paschal II | 77%
|
| 1378-1394 | VII | Clement | Urban VI, Boniface IX | 77%
|
| 1423-1429 | VIII | Clement | Martin V | 77%
|
| 1012 | VI | Gregory | Benedict VIII | 77%
|
| 1118-1121 | VIII | Gregory | Gelasius II, Callixtus II | 77%
|
| 1179-1180 | III | Innocent | Alexander III | 62%
|
| 355-365 | II | Felix | Liberius | 54%
|
| 1439-1449 | V | Felix | Eugene IV, Nicholas V | 54%
|
| 1061-1064 | II | Honorius | Alexander II | 54%
|
| 1328-1330 | V | Nicholas | John XXII | 54%
|
| 687 | Paschal | Sergius I | 54%
| |
| 1164-1168 | III | Paschal | Alexander III | 54%
|
| 1168-1178 | III | Callixtus | Alexander III | 46%
|
| 1138 | IV | Victor | Innocent II | 46%
|
| 1159 -1164 | IV | Victor | Alexander III | 46%
|
| 767-768 | II | Constantine | Between Paul I and Stephen III | 38%
|
| 1101-1102 | Adalbert | Paschal II | 31%
| |
| 855 | Anastasius Bibliothecarius | Benedict III | 31%
| |
| 1124 | II | Celestine | Honorius II | 31%
|
| 1105-1111 | IV | Sylvester | Paschal II | 31%
|
| 687 | Theodore | Sergius I | 31%
| |
| 1100-1101 | Theodoric | Paschal II | 31%
| |
| 1130-1138 | II | Anacletus | Innocent II | 23%
|
| 309-210 | Heraclius | Eusebius | 23%
| |
| 251-258 | Novatian | Cornelius, Lucius I, Stephen I, Sixtus II | 23%
| |
| 768 | Philip | Stephen III | 23%
| |
| 217-235 | Saint Hippolytus | Callixtus I, Urban I, Pontian | 23%
| |
| 903-904 | Christopher | Between Leo V and Sergius III | 15%
| |
| 530 | Dioscorus | Boniface II | 15%
| |
| 418-419 | Eulalius | Boniface I | 15%
| |
| 498-506/8 | Laurentius | Symmachus | 15%
| |
| 199-200 | Natalius | Zephyrinus | 15%
| |
| 366-367 | Ursicinus | Damasus I | 15%
|