- Commercial courts1
- Concini family1
- Concini, Giovanbattista1
- Confession--Catholic Church1
- Conspiracy of Catiline (Rome : 65-62 B.C.)1
- Contemplation1
- Controversial literature1
- Convento di S. Maria degli Angeli (Florence, Italy)1
- Coppetti, Coppetto1
- Coppetti, Coppo1
- Coptic Church1
- Coptic manuscripts1
- Corbinelli, Bernardo1
- Corbinelli, Girolamo1
- Corbinelli, Pandolfo1
- Correspondence1
- Correspondence (Cyprian, Saint, Bishop of Carthage)1
- Cortigiani, Giovanni1
- Cosimo I, Grand-Duke of Tuscany, 1519-15741
- Cosimo II, Grand Duke of Tuscany, 1590-16211