- Love poetry, English (Middle)1
- Lydgate, John, 1370?-1451?1
- Magna Carta1
- Majolus, Saint, Abbot of Cluny, approximately 906-9941
- Manichaeism1
- Marina, Saint1
- Massachusetts--Williamstown1
- Materia medica, Vegetable1
- Mathematics1
- Missals (Service books)1
- Monasticism and religious orders1
- Monasticism and religious orders--Rules1
- Moral education1
- Musical notation1
- Mysteries and miracle-plays, English1
- Nautical charts1
- Neuland, Walter, active 14501
- Ninth century1
- Nobility1
- Norbert, of Xanten, Saint, approximately 1080-11341