- Jews--Persecutions1
- Jiří, z Poděbrad, King of Bohemia, 1420-14711
- John VIII Palaeologus, Emperor of the East, 1392-14481
- John, the Apostle, Saint1
- John, the Baptist, Saint1
- Joseph (Son of Jacob)1
- Judgment Day1
- Jugurthine War (111-105 B.C.)1
- Julius III, Pope, 1487-15551
- Jābir ibn Ḥayyān1
- Kings and rulers--Duties1
- Kings and rulers--Heraldry1
- Kirchmair, Georg, 1481-15541
- Knights of Malta1
- Knowledge, Theory of1
- Kölner Dom1
- Ladino language1
- Land titles--Registration and transfer1
- Lang, Matthäus, 1468-15401
- Latin America1