- Maps1
- Marriage (Canon law)1
- Marriage (Canon law)--Dispensations1
- Marshals1
- Mayenne, Charles de Lorraine, Duc de, 1554-16111
- Medina Sidonia, Alonso Pérez de Guzmán, duque de, 1550-16191
- Medina Sidonia, Juan Alonso de Guzmán, Duque de, -15581
- Medina, Francisco de, 1544-16151
- Meditations1
- Mexico--Mexico City1
- Missals1
- Missions, Portuguese1
- Montserrat (Abbey)1
- Natural law1
- Nautical charts1
- Order of the Golden Fleece1
- Orders of knighthood and chivalry1
- Passion of Jesus Christ1
- Pelayo, King of Asturias, -7371
- Philip IV, King of Spain, 1605-16651