- Manuscripts, Medieval1
- Marriage (Roman law)1
- Martinus, Polonus, -12791
- Mary Magdalene, Saint1
- Mass (Music)1
- Mass--Celebration1
- Maxims1
- Medici, Lorenzo de', 1449-14921
- Medicine, Ancient1
- Medicine, Medieval1
- Medicine--Study and teaching1
- Mehmed II, Sultan of the Turks, 1432-14811
- Merovingian scripts1
- Metaphysics (Aristotle)1
- Mexico--Chiapas1
- Michaelmas1
- Miracles1
- Monardes, Nicolás, approximately 1512-15881
- Monasteries1
- Monasterio de San Jerónimo de Monte Olivete (Sant Pere de Ribes, Spain)1