- Italy--Orvieto2
- Italy--Perugia (Province)2
- Italy--Piacenza2
- Italy--Pienza2
- Italy--Valle d'Aosta2
- Italy--Verona2
- Jewish sermons, Hebrew2
- Jews--Dietary laws2
- John, the Apostle, Saint2
- Judaism--Prayers and devotions2
- Julian, of Eclanum, Bishop, 380-approximately 4552
- Justinian I, Emperor of the East, 483?-5652
- Knights and knighthood2
- Kyriales2
- Latin language, Medieval and modern2
- Latin language--Metrics and rhythmics2
- Latin language--Syntax2
- Law reports, digests, etc.2
- Little office of the Immaculate Conception2
- Liturgics--Texts2