Name
- 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, 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
- Corradini, Pier Marcellino, Cardinal 17121
- 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
- Dandini, Pietro, correspondent of Luigi Gualterio, fl 1751-17531
- Danza, Flaminio, Bishop of Sant'Agata de' Goti, 1691-17621
- Discreti, Francesco, correspondent of Luigi Gualterio, fl 17281
- Doria, Giovanni Andrea, naval officer, 1539-16061
- Elci,, Ranieri, alias Ilcio; Cardinal, Prolegate of Arignon1
- Emesa, Archbishop of1
- Erizzo, Giacomo Maria, Bishop of Concordia, Italy, fl 1723-17601
- Ferniani, Francesco Ricardo, Governor of Orvieto and Bishop of Perugia, 1686-17621