Author
- Cardinal Girolamo Grimaldi1
- Carlo Carafa1
- Carlo da Corte1
- Carlo de' Medici1
- Cassinese Congregation1
- Cassius Dio1
- Castello del Vivaro1
- Castelvetro, Giacomo, 1546-1616?1
- Cattanei family1
- Cavallero, Francisco1
- Cavalli1
- Celestino Bistomago1
- Chancery of Apostolic Briefs1
- Charles Howard, 1st Earl of Nottingham1
- Charles IX of France1
- Chaves, Melchor de1
- Christophe de Paris1
- Church of the East1
- Cipriano de Valera1
- Clare of Assisi1