- Confession--Catholic Church1
- Conscience1
- Conspiracy of Catiline (Rome : 65-62 B.C.)1
- Contemplation1
- Copyists1
- Corbinelli, Bernardo1
- Corbinelli, Girolamo1
- Corbinelli, Pandolfo1
- Cornerpieces (Furniture)1
- Correspondence (Cyprian, Saint, Bishop of Carthage)1
- Cosimo II, Grand Duke of Tuscany, 1590-16211
- Cosimo III, Grand-Duke of Tuscany, 1642-17231
- Cosmography1
- Cosmology1
- Courts and courtiers1
- Covoni, Luigi de1
- Criminal law1
- Cristofano, Filippo di1
- Criticism, Textual1
- Crusades (Fifth) (1218-1221)1