- Louis, Saint, Bishop of Toulouse, 1274-12971
- Love1
- Luxembourg1
- Luxeuil1
- Macaronic poetry1
- Macaronic verse1
- Malchus, Saint1
- Mandeville, John, Sir1
- Manuel I, King of Portugal, 1469-15211
- Manuscript maps1
- Manuscripts, English (Old)1
- Manuscripts, Greek (Medieval and modern)1
- Manuscripts, Portuguese1
- Manuscripts, Provençal1
- Manzoli, Marchione1
- Marginalia1
- Maria Anna Josefa, Queen, consort of John V, King of Portugal, 1683-17541
- Marriage (Canon law)--Dispensations1
- Marriage (Roman law)1
- Martino, Odino S., active 15th century1