- Catholic Church. Archdiocese of Siena (Italy)2
- Catholic Church. Collegium Cardinalium1
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- Catholic Church. Ordo divini officii (Archdiocese of Mainz : Rhineland-Palatinate, Germany)1
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- Cattani, Biagio1
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- Caucasus4
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- Charlemagne, Emperor, 742-81418
- Charles VII, King of France, 1403-14611
- Charles, Duke of Burgundy, 1433-14771
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