- Cocchi Donati, Piera1
- Colombino, Giorgio di1
- Commercial courts1
- Concini family1
- Concini, Giovanbattista1
- Confiscations1
- Conscience1
- Consolation (Islam)1
- Convento di S. Maria degli Angeli (Florence, Italy)1
- Coppetti, Coppetto1
- Coppetti, Coppo1
- 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
- Cosimo III, Grand-Duke of Tuscany, 1642-17231