- Jews--Conversion to Christianity1
- Jews--Persecutions1
- Jiří, z Poděbrad, King of Bohemia, 1420-14711
- Joannes de Caligariis1
- Job (Biblical figure)1
- John, Duke of Burgundy, 1371-14191
- John, of Daylam1
- John, the Apostle, Saint1
- John, the Baptist, Saint1
- Joseph (Son of Jacob)1
- Juan II, King of Castile and Leon, 1405-14541
- Judaism (Christian theology)1
- Judaism--Doctrines1
- Judaism--Roman rite1
- Judaism--Roman rite--Liturgy1
- Judas Iscariot1
- Judeo-Arabic literature1
- Judeo-Persian language1
- Judgment Day1
- Judgment Day (Islam)1