- Circle--Religious aspects1
- Classical biography1
- Codex (Corpus juris civilis)1
- Coligny, Gaspard de, seigneur de Châtillon, 1519-15721
- Collault, Étienne, active 1512-15451
- Commandments, Six hundred and thirteen1
- Commerce1
- Compass1
- Compendium theologicae veritatis (Hugo, Argentinensis)1
- Confession (Canon law)1
- Confraternities1
- Congregazione di San Giorgio in Alga (Venice, Italy)1
- Congregação di San João Evangelista (Portugal)1
- Consanguinity (Canon law)1
- Conscience1
- Constantine XI Palaeologus, Emperor of the East, 1405-14531
- Constitutional history1
- Contubernium rosae1
- Copyists1
- Cornelio, Giovanni1