- Clement VIII, Pope, 1536-16051
- Clothing and dress1
- Codaro, Abramo1
- Commentaries1
- Commerce1
- Commercial law1
- Concini family1
- Concini, Alessandra Antinori1
- Concini, Arrigo1
- Concini, Giovanbattista1
- Controversial literature1
- Correspondence1
- Cortesi, Girolamo1
- Cosimo II, Grand Duke of Tuscany, 1590-16211
- Cosimo III, Grand-Duke of Tuscany, 1642-17231
- Criticism and interpretation1
- Cryptography1
- Cueva y de Castilla, Beltrán III de la, Duke of Alburquerque, -16121
- Czech Republic--Prague1
- De anima (Aristotle)1