- John the Baptist's Day1
- Judaism1
- Jugurthine War (111-105 B.C.)1
- Julian, of Eclanum, Bishop, 380-approximately 4551
- Justa, Saint, -approximately 2871
- Justinian I, Emperor of the East, 483?-5651
- Kings and rulers--Duties1
- Knotesford, John, -15891
- Knowledge, Theory of (Religion)1
- Kyriales1
- Ladron de Guevara family1
- Land tenure--Law and legislation1
- Land titles--Registration and transfer1
- Language and languages1
- Lapidaries (Medieval literature)1
- Latin language, Medieval and modern1
- Latin language--Etymology1
- Latin language--Synonyms and antonyms1
- Latin literature, Medieval and modern1
- Latin poetry, Medieval and modern1