Name
- Cathelan1
- Ciocchi, Gian Angelo, Archbishop of Brindisi1
- Cioffi, Niccolò, Bishop of Sora, afterwards Archbishop of Amalfi1
- Ciogni, P- A-, Canon1
- Collicola, Francesco1
- Colloredo, Fabio Leandro1
- Colon de Portugal, Pedro, 8th Duque de Veragua, Admiral of the Indies1
- Colonna di Sciarra, Egidio, Bailly of Malta, General of the Galleys1
- Colonna, Girolamo, Cardinal1
- Colonna, Prospero, Cardinal1
- Cordova y la Cerda, Hieronyma Maria, wife of Nicolas, Duke of Feria and Medina Celi1
- Cordova y la Cerda, Nicolas Maria Fernandez, Count of Priego, Duke of Feria and Medina Celi1
- Corsini, Bartolomeo, Prince of Sisismeno, Viceroy of Sicily1
- Coscia, Nicolò, Cardinal 17251
- Costa, Gaetano, Bishop of Cotrone1
- Curli, Silvestro1
- Dandini, Anselmo, correspondent of Luigi Gualterio, fl 17301
- Danza, Flaminio, Bishop of Sant'Agata de' Goti, 1691-17621
- Dhuet de St. Antoine, -, prior and correspondent of Luigi Gualterio, fl 1756-17591
- Discreti, Francesco, correspondent of Luigi Gualterio, fl 17281