Name
- Cosimo I, Grand Duke of Tuscany1
- Cosimo II, Grand Duke of Tuscany1
- Council of Trent1
- Cusani, Celso1
- Delfino, Zaccaria, cardinal, Bishop of Hvar and papal nuncio, 1527-15831
- Eggenberg, Johann Anthon I von, Prince, Duke of Crumau, Imperial Ambassador to Urban VIII1
- Emanuel Philibert, Duke of Savoy1
- Fabri, Girolamo, correspondent of Celso Cusani, fl 16221
- Facchinetti, Cesare, cardinal, 1608-16831
- Fedelissimi, Giovanni Battista, physician and poet, 1560-16351
- Francesco Maria II, Duke of Urbino1
- Franqueza y Esteve, Pedro, Conde de Villalonga, Secretary of State of Philip III of Spain1
- Galasso, Mathias, soldier and army commander, 1584-16471
- Galeota, Fabio, jurist, 1572-16451
- Gambara, Gianfrancesco, cardinal and Bishop of Viterbo, 1533-15871
- General Court of Rome1
- Giovio, Paolo, historian and Bishop of Nocera, 1483-15521
- Gregory XIV, Pope, 1535-15911
- Gualterio, Sebastiano, Bishop of Viterbo1
- Guzzoni, Vincenzo, of Venice, diplomat, fl 1617-16291