- Martini, Roberto2
- Mary, Queen of Scots, 1542-15872
- Massachusetts--Wellesley2
- Medici, Alessandro de', 1510-15372
- Medici, Andrea de'2
- Medici, Bernardo de'2
- Medici, Bivigliano de'2
- Medici, Carlo de'2
- Medici, Fabrizio de'2
- Medici, Giovanni de'2
- Medici, Lorenzo de', 1449-14922
- Medicine, Medieval2
- Medicine--Formulae, receipts, prescriptions2
- Mediterranean Region2
- Metaphysics2
- Middle East--Palestine2
- Military campaigns2
- Monasteries2
- Monastic and religious life--Middle Ages2
- Monasticism and religious orders for women2