Author
- Ivo of Chartres1
- Jacobus de Voragine1
- Jacques Bruyant1
- Jacques Millet1
- Jean Barthélémy1
- Jean Bayard1
- Jean Filesac1
- Jean Germain1
- Jean Gerson1
- Jean Marot1
- Jerome1
- Johannes Hymmonides1
- Johannes de Sacrobosco1
- John of Damascus1
- John of Saxony1
- Julianus Pomerius1
- Kalonymus ben Kalonymus1
- Kimhi Yitzhak ben Mordekhai1
- Laurent d'Orleans1
- Marion, Jehan, -1580?1