Name
- Charles II, of Spain, 1661-17001
- Chigi, Flavio, Cardinal 16571
- Christian V, of Denmark, 1646-16991
- Cibo, Alderano, Cardinal 1645, Secretary of State 16761
- Cibo, Carlo, Duca di Massa1
- Ciceri, Carlo Steffano, Cardinal1
- Cloche, Antonin, Master General of the Dominicans1
- Codebeau, -, correspondent of John Caryll, fl 16871
- Colloredo, Leandro, Cardinal 16811
- Colonna, Federico, Cardinal1
- Colonna, Maria, wife of Lorenzo Onofrio, Duke of Pagliano, Constable of Naples1
- Cope, Henry, of Add MS 282371
- Corsi, Domenico Maria, Cardinal1
- Couper, David, Writer to the Signet1
- Crawford, Patrick, Writer to the Signet1
- Crescentio, Alessandro, Cardinal1
- Croy, Marie Joséphine, wife of Ferdinand de Croy, Duc d'Havré et de Croy1
- Denhoff, Jan Kazimierz, cardinal and bishop of Cesena, 1649-16971
- Drouane, Gertrude Elizabet, of Turin, nun, fl 16881
- Dunk, George, 2nd Earl of Halifax, né Montagu, politician and statesman, 1716-17711