- Initials1
- Inscriptions1
- International relations1
- Italy--Colle di Val d'Elsa1
- Italy--Siena1
- Jesuits1
- John IV, King of Portugal, 1604-16561
- John Manuel, Prince of Portugal, 1537-15541
- John V, King of Portugal, 1689-17501
- Juana, of Austria, Princess of Portugal, 1535-15731
- Judaism1
- Lafões, Pedro Henrique de Bragança, Duque de, 1718-17611
- Latin language, Medieval and modern1
- Latin language, Medieval and modern--Rhetoric1
- Law1
- Learning and scholarship1
- Letters, Papal1
- Liturgics1
- Lord's Supper--Catholic Church--History of doctrines1
- Lord's prayer1