- Manuscripts, Italian1
- Manuscripts, Portuguese1
- Margarita, de Austria, Queen, consort of Philip III, King of Spain, 1584-16111
- Marriage (Canon law)1
- Marriage (Canon law)--Dispensations1
- Marshals1
- Mary, of Bethany, Saint1
- Mayenne, Charles de Lorraine, Duc de, 1554-16111
- Medina, Francisco de, 1544-16151
- Missions, Portuguese1
- Monarchy1
- Monasteries1
- Monasterio de Villaverde de Sandoval1
- Monastic and religious life1
- Montserrat (Abbey)1
- Muñiz de Orellana, Francisco1
- Muñiz, Gonzalo1
- Mysticism1
- Navarre (Kingdom)1
- Oratory1