- 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
- Ludwig IV, Holy Roman Emperor, 1282?-13471
- Manuel I, King of Portugal, 1469-15211
- Manuscripts, English (Middle)1
- Manuscripts, German1
- Manuscripts, Hebrew1
- Manuscripts, Portuguese1
- Marginalia1