- Jewish philosophy1
- Jewish religious poetry1
- Jews--Persecutions1
- Jiří, z Poděbrad, King of Bohemia, 1420-14711
- Joannes de Caligariis1
- John, the Baptist, Saint1
- Joseph (Son of Jacob)1
- Judaism--Roman rite1
- Judaism--Roman rite--Liturgy1
- Judgment Day1
- Julian, of Eclanum, Bishop, 380-approximately 4551
- Kölner Dom1
- Labyrinths1
- Lamberto, Jacopo di1
- Lanaiolo, Gherardo1
- Land tenure1
- Land titles--Registration and transfer1
- Laterino, Cristoforo1
- Laterino, Pietro1
- Latin language--Orthography and spelling1