- Jews--Persecutions1
- Jiří, z Poděbrad, King of Bohemia, 1420-14711
- John, Duke of Burgundy, 1371-14191
- Joseph (Son of Jacob)1
- Juan II, King of Castile and Leon, 1405-14541
- Judaism1
- Julii family1
- Jāmiʻ al-Muẓaffarī (Damascus, Syria)1
- Khabbāzī, ʻUmar ibn Muḥammad, 1231 or 1232-1292. Mughnī fī uṣūl al-fiqh1
- Khaṭīb al-Baghdādī, Abū Bakr Aḥmad ibn ʻAlī, 1002-1071. Asmāʼ al-mubhamah fī al-anbāʼ al-muḥkamah1
- Kings and rulers--Duties1
- Kings and rulers--Genealogy1
- Lamberto, Jacopo di1
- Lanaiolo, Gherardo1
- Land titles1
- Land titles--Registration and transfer1
- Landowners1
- Laterino, Cristoforo1
- Laterino, Pietro1
- Latin (Latin Europe)1