- Lafões, Pedro Henrique de Bragança, Duque de, 1718-17611
- Law1
- Lion hunting1
- Lippomano, Luigi, 1500-15591
- Louis XII, King of France, 1462-15151
- Manuel I, King of Portugal, 1469-15211
- Manuscripts, Catalan1
- Manuscripts, Portuguese1
- Maria Anna Josefa, Queen, consort of John V, King of Portugal, 1683-17541
- Marriage (Canon law)1
- Marriage (Canon law)--Dispensations1
- Medicine1
- Medicine--Formulae, receipts, prescriptions1
- Mehmed II, Sultan of the Turks, 1432-14811
- Missions1
- Montserrat (Abbey)1
- Mosteiro de S. Mónica (Lisbon, Portugal)1
- Naples (Kingdom)1
- Netherlands1
- Nobility1