Author
- Jacques Lempereur1
- James of Milan1
- Jean Carteron1
- Jean de Meun1
- Jean de Roquetaillade1
- Johanna Hawkeslowe (Sr.)1
- John Burgh1
- John Cleseby1
- John Davnay1
- John Halgren of Abbeville1
- John Wycliffe1
- John of Lancaster, 1st Duke of Bedford1
- John of Saxony1
- John of Wales1
- Josephus1
- Juvenal1
- Kingdom of France1
- Klaus von Stille1
- Konrad von Brundelsheim1
- Laurent d'Orleans1