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- Relations[remove]13
- Catholic Church12
- Papacy12
- History8
- Orthodox Eastern Church5
- Foreign relations4
- Orthodox Eastern authors2
- Anglican orders1
- Christianity1
- Christianity and other religions1
- Church history1
- Church of England1
- Crusades1
- Diplomatic service1
- Doctrinal and controversial works1
- Doctrines1
- Frederick II, Holy Roman Emperor, 1194-12501
- Giovanni, da Parma, approximately 1208-12891
- Infallibility1
- Interfaith relations1