Name
- Calas, Jean, of Toulouse1
- Cathala1
- Cecil, Robert, Viscount Cranborne, 1st Earl of Salisbury, 1563-16121
- Chauvelin, Bernard Louis, Marquis, Ambassador to Turin1
- Cibo, Alderano, Cardinal 1645, Secretary of State 16761
- Claudia, Archduchess of Austria, wife of the Archduke Leopold1
- Clement VII, Pope, 1478-15341
- Cloche, Antonin, Master General of the Dominicans1
- Conti di Campello, Solone de'1
- Cooper, John Fletcher, Attorney's Clerk at Yarmouth1
- Corso, Lorenzo, of Rhoana1
- Cosmo I, Grand Duke of Tuscany1
- Cosmo II, Grand Duke of Tuscany1
- Cox, Thomas, of Add MS 237261
- Dutens, Louis, diplomat, chaplain and writer, 1730-18121
- Echeuerry, Emmanuel Vincent, General of the Friars Preachers1
- Egerton, Thomas, 1st Baron Ellesmere, 1st Viscount Brackley, 1540-16171
- Enriquez, Julian, Portuguese factor, fl 15911
- Estrées, César d', Bishop of Laon, Cardinal 16721
- Felton, Samuel, correspondent of John Howard, fl 17591