Name
- Clavezana, Onorato Luigi1
- Coke, T-, of Add MS 203101
- Colgrave, George, Chevalier de St Louis1
- Colon de Portugal, Pedro Manuel, 7th Duque de Veragua, Admiral of the Indies1
- Commercati, Giuseppe Carlo1
- Connell, Chaplain to the Pretender1
- Cordoue Lanti, Alexandre1
- Cordova y la Cerda, Hieronyma Maria, wife of Nicolas, Duke of Feria and Medina Celi1
- Cornaro, Federico, Vice-Legate of Bologna1
- Cornejo, Felix1
- Courcillon, Philippe, Marquis de Dangeau, Governor of Touraine1
- Court of Rome1
- Cremona, Mutio Francesco1
- Croy, Jean Baptiste François Joseph, Duc d'Havré et de Croy1
- Croy, Marie Anne, wife of J B F J de Croy, Duc d'Havré et de Croy1
- Csaky, Emeric, Cardinal, Archbishop of Colocza1
- Daillon, Marguerite Louise Susanne, Duchesse du Lude, wife of Henri de Daillon, Duc du Lude, 1643-17261
- Dasca, Antonio, correspondent of Cardinal Filippo Gualterio, fl 17231
- Davanzati, Teodoro, correspondent of Cardinal Filippo Gualterio, fl 17111
- Den, Tobias, correspondent of Cardinal Filippo Antonio Gualterio, fl 1700-17251