- Calendar, Gregorian1
- Calera, Rodrigo1
- Cambrai, League of, 15081
- Canonists1
- Cantillation--Instruction and study1
- Capital punishment (Jewish law)1
- Capponi family1
- Carnesecchi, Amerigo1
- Catherine, of Siena, Saint, 1347-13801
- Catholic Church. Collegium Cardinalium1
- Catholic Church. Curia Romana1
- Catholic Church. Diocese of Cortona (Italy)1
- Catholic Church. Diocese of Pistoia (Italy)1
- Catholic Church. Diocese of Sion (Switzerland)1
- Catholic authors1
- Catiline, approximately 108 B.C.-62 B.C.1
- Caṇḍi (Hindu deity)1
- Ceccoli, Baldo1
- Ceccoli, Bartolo1
- Censures, Ecclesiastical1