- Julian, of Eclanum, Bishop, 380-approximately 4551
- Julii family1
- Justinian I, Emperor of the East, 483?-5651
- Kapitalbünde1
- Kings and rulers--Succession1
- Kinot1
- Knights and knighthood1
- Labyrinths1
- Lamucci, Corso1
- Landlord and tenant1
- Language and languages1
- Language and languages--Philosophy1
- Lanvers, Hamo1
- Lapidaries (Medieval literature)1
- Lathom, Robert de, 13th century1
- Latin language, Medieval and modern--Grammar1
- Latin language, Medieval and modern--Rhetoric1
- Latin language, Medieval and modern--Study and teaching1
- Latin language--Synonyms and antonyms1
- Latin language--Versification1