- Italy--Serravalle Pistoiese1
- Italy--Terranuova Bracciolini1
- Italy--Vernio1
- Italy--Vicenza1
- Italy--Vicopisano1
- Iḥyāʼ ʻulūm al-dīn (Ghazzālī)1
- Jacopo, Bernardo di1
- Jacopo, Giovanni di1
- Jerome, Saint, -419 or 4201
- Jesus Christ1
- 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