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- Constans I, Roman Emperor
- Constans II Pogonatus, Byzantine Emperor
- Constanta
- Constantine I, The Great, Roman Emperor
- Constantine II, Antipope
- Constantine III Leichudes, Patriarch of Constantinople
- Constantine IV, Byzantine Emperor
- Constantine IX Monomachus, Byzantine Emperor
- Constantine of Barbanson
- Constantine the African
- Constantine V, Byzantine Emperor
- Constantine VII Porphyrogenitus, Byzantine Emperor
- Constantine VII Porphyrogenitus°
- Constantine XI Palaeologus, Byzantine Emperor
- Constantine, Pope
- Constantiner, Jaime
- Constantini, Humberto
- Constantinople (Byzantium, Istanbul)
- Constantinople I, Council of
