- Cosimo I, Grand-Duke of Tuscany, 1519-15741
- Cosimo II, Grand Duke of Tuscany, 1590-16211
- Cosimo III, Grand-Duke of Tuscany, 1642-17231
- Cottricciaio, Mariotto1
- Courtly love1
- Courts1
- Courts and courtiers1
- Covoni, Luigi de1
- Cresci, Mariotto1
- Crespo, Johannes1
- Cressida (Fictitious character)1
- Cristofano, Filippo di1
- Cristoforo, Pietro di1
- Criticism, Textual1
- Croatia--Šibenik1
- Cryptography1
- Customary law1
- Czech Republic--Brno1
- Darius I, King of Persia, 548 B.C.-485 B.C.1
- Dati, Agostino, 1420-14781