- Jugurthine War (111-105 B.C.)1
- Justinian I, Emperor of the East, 483?-5651
- Latin language--Etymology1
- Law, Medieval1
- Letters patent1
- Love1
- Love poetry, English (Middle)1
- Manuscript waste1
- Manuscripts, German1
- Manuscripts, Greek (Medieval and modern)1
- Mary, Blessed Virgin, Saint1
- Massachusetts--Boston1
- Medicine, Medieval1
- Military art and science1
- Military history, Medieval1
- Missals (Service books)1
- Musical notation1
- Mysteries and miracle-plays, English1
- Mysticism1
- Mysticism--Middle Ages1