- Manuscripts, French1
- Manuscripts, German1
- Manuscripts, Italian6
- Manuscripts, Latin7
- Manuscripts, Latin (Medieval and modern)11
- Manuscripts, Medieval4
- Manuscripts, Portuguese1
- Manuscripts, Renaissance17
- Manuscripts, Spanish5
- Marginalia2
- Maria Anna Josefa, Queen, consort of John V, King of Portugal, 1683-17541
- Merchants1
- Methodology1
- Mexico2
- Middle Ages1
- Middle East--Jerusalem1
- Middle East--Jerusalem (Latin Kingdom)1
- Missions1
- Mosteiro de S. Mónica (Lisbon, Portugal)1
- Naples (Kingdom)1