- Clare, of Assisi, Saint, 1194-12531
- Clothing and dress1
- Clusius, Carolus, 1526-16091
- Codaro, Abramo1
- Coligny, Gaspard de, seigneur de Châtillon, 1519-15721
- Collections1
- Colombia1
- Colombia--Cartagena1
- Concini, Alessandra Antinori1
- Concini, Arrigo1
- Concini, Bernardo1
- Concini, Lucrezia1
- Conduct of life1
- Conquerors1
- Construction industry1
- Controversial literature1
- Cornelio, Giovanni1
- Cortesi, Girolamo1
- Cosimo II, Grand Duke of Tuscany, 1590-16211
- Cosimo III, Grand-Duke of Tuscany, 1642-17231