- Juana, of Austria, Princess of Portugal, 1535-15731
- Judaism1
- Lafões, Pedro Henrique de Bragança, Duque de, 1718-17611
- Law1
- Letters, Papal1
- Ludwig IV, Holy Roman Emperor, 1282?-13471
- Manuel I, King of Portugal, 1469-15211
- Manuscripts2
- Manuscripts, Latin7
- Manuscripts, Latin (Medieval and modern)1
- Manuscripts, Medieval3
- Manuscripts, Portuguese1
- Manuscripts, Renaissance5
- Manuscripts, Spanish3
- Maria Anna Josefa, Queen, consort of John V, King of Portugal, 1683-17541
- Małogoszcz (Poland)1
- Missions1
- Mosteiro de S. Mónica (Lisbon, Portugal)1
- Netherlands1
- Oria, Johannes d'1