Bibliography
Hans Walter Klewitz, Reformpapsttum und Kardinalkolleg, Darmstadt 1957
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Antipopes of the Roman Catholic Church
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- Hippolytus
- Novatian
- Felix II
- Ursicinus
- Eulalius
- Laurentius
- Dioscorus
- Theodore
- Paschal
- Constantine II
- Philip
- John VIII
- Anastasius
- Christopher
- Boniface VII
- John XVI
- Gregory VI
- Benedict X
- Honorius II
- Clement III
- Theodoric
- Adalbert
- Sylvester IV
- Gregory VIII
- Celestine II
- Anacletus II
- Victor IV (1138)
- Victor IV (1159–1164)
- Paschal III
- Callixtus III
- Innocent III
- Nicholas V
- Clement VII
- Benedict XIII
- Alexander V
- John XXIII
- Clement VIII
- Benedict XIV
- Felix V
- Modern claimants to papacy
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