Author
- Jacopo Nannis de Piccolomini1
- Jacopo Piccolomini-Ammannati1
- Jacopone da Todi1
- Jacques Lempereur1
- Jacques de Vitry1
- Jean Marot1
- Jerome1
- Joanna I of Naples1
- Joannes Dominicus de Marchis1
- Johanna Hawkeslowe (Sr.)1
- John Cleseby1
- John Eyr1
- John Gage1
- John Gower1
- John Skyrrow1
- John Tiptoft, 1st Earl of Worcester1
- John of Glastonbury1
- John of Lancaster, 1st Duke of Bedford1
- John, Duke of Berry1
- Josephus1