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- Athanasius III of Alexandria
- Athanasius II (Pattelarus) of Constantinople
- Athanasius II Dabbas of Antioch
- Athanasius II of Alexandria
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- Athanasius I of Constantinople
- Athanasius I of Naples
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- Athanasius V of Jerusalem
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- Athanasius of Brest
- Athanasius of Bretsk
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- Athanasius the Great
- Athanasius the Martyr of Sabaste
- Athanasius the Reader
- Athanasius the Superintendent of Prisoners
- Athanasy (Martos) of Brisbane
- Athanasy (Martos) of Buenos Aires
- Atheism
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- Athenagoras (Peckstadt) of Belgium
- Athenagoras (Peckstadt) of Sinope
- Athenagoras I
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- Athenagoras I (Spyrou) of Constantinople
- Athenagoras of Athens
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- Augustine (Markevitch) of Lviv
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- Bartholomeos (Katsouris) of Megara
- Bartholomew I
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- Baselios Didymos I
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- Callinicus III of Constantinople
- Callinicus IV of Constantinople
- Callinicus I of Constantinople
- Callistratus (Tsintsadze) of Georgia
- Callistus I of Constantinople
- Callistus I of Rome