Name
- Charles Christian, Prince of Nassau-Weilburg1
- Charles Frederick, Margrave of Baden-Durlach, 1728-18111
- Charles II, of Spain, 1661-17001
- Charles XI, of Sweden, 1655-16971
- Christian Albert, Duke of Schleswig-Holstein-Gottorp, of Egerton MS 33541
- Christian V, of Denmark, 1646-16991
- Clevlard, John, Secretary to the Admiralty1
- Clifford, George, banker, of Amsterdam1
- Cobenzl, Johann Karl Philipp, Count, Imperial diplomatist1
- Colloredo, Karl Borromäus, Count, Imperial Envoy to England1
- Colt, William Dutton, diplomatist1
- Comte, Caterine, wife of F Comte1
- Comte, F., English secret agent1
- Conflans, Louis de Brienne, Marquis d'Armentières, Maréchal de France 17681
- Contades, Louis Georges Erasme, Marquis de Contades, Maréchal de France1
- Cornabé, Francis, Major-General; Envoy of the Princess of Orange to Brussels1
- Corry, Trevor, British Consul at Danzig1
- Cosimo III, Grand Duke of Tuscany1
- Coventry, Henry, Sec of State, 1619-16861
- Cros, Josef August, correspondent of Sir Thomas Osborne, 1st Duke of Leeds, fl 16791