- Clement VIII, Pope, 1536-16051
- Clergy--Pensions1
- Coasts1
- Codaro, Abramo1
- Coligny, Gaspard de, seigneur de Châtillon, 1519-15721
- Colors1
- Columbus, Christopher1
- Comedy plays1
- Commandments, Six hundred and thirteen1
- Commercial correspondence, Hebrew1
- Commercial law1
- Commercial law (Jewish law)1
- Compass1
- Compasses (Mathematical instruments)1
- Concini, Alessandra Antinori1
- Concini, Arrigo1
- Concini, Bernardo1
- Concini, Lucrezia1
- Concubinage1
- Confraternitate Sancta Maria Rotunda (Confraternity : Milan, Italy)1