- Lafões, Pedro Henrique de Bragança, Duque de, 1718-17611
- Law1
- Letters, Papal1
- Luxembourg1
- Manuel I, King of Portugal, 1469-15211
- Manuscripts1
- Manuscripts, French1
- Manuscripts, Portuguese1
- Maria Anna Josefa, Queen, consort of John V, King of Portugal, 1683-17541
- Massachusetts--Boston1
- Meditations1
- Missions1
- Monastic and religious life1
- Monastic and religious life of women1
- Mosteiro de S. Mónica (Lisbon, Portugal)1
- Musical notation1
- Parliamentary practice1
- Penance1
- Philip, Duke of Burgundy, 1396-14671
- Plague1