Name
- Fitzherbert, Thomas, Jesuit writer, 1552-16401
- Francis Maria, Grand Duke of Tuscany1
- Gama, Francisco, 4th Count of Vidigueyra, army officer, courtier and Viceroy of India, 1565-16321
- Garcés, Martin, Grand Master of the Knights Hospitallier, 1526-16011
- Gianfigliazzi, Bongianni, diplomat and soldier, 1549-after 16151
- Girón, Pedro, 3rd Duke of Osuna, politician and Viceroy of Naples, 1574-16241
- Giudice del), Francesco, Cardinal1
- Gonzaga, Francesco, Prince of Castiglione, diplomat and landowner, 1577-16161
- Gonzaga, Vespasiano, Duke of Sabbionetta, alias Gonzaga-Colonna, condottiero, politician and patron of the arts, 1531-15911
- Gonzalez, Juan, correspondent of Luis Carrillo de Toledo, Marquis of Caraçena, fl 16161
- Gouvea, Christovao, Jesuit and writer, 1542-16221
- Graçian, Antonio, secretary to King Philip II, fl Late 16th century1
- Gregory XIII, Pope, 1502-15851
- Gregory XIV, Pope, 1535-15911
- Gregory XV, Pope, 1554-16231
- Guidobaldo II, Duke of Urbino1
- Guzman, Alfonso Perez, Titular Archbishop of Tyre and Patriarch of the West Indies, fl 1625-16701
- Guzman, Pedro, correspondent of Luis da Cuña, Marquis of Caraçena, fl 16221
- Haller, Ricardo1
- Hassan Ali, Persian Ambassador to Portugal1