Author
- Jiménez de Enciso, Andrés1
- Joanna I of Naples1
- Joanna of Austria, Princess of Portugal1
- Joannes Dominicus de Marchis1
- Joannes de Crivelli1
- Johanna Hawkeslowe (Sr.)1
- Johannes Tostius1
- Johannes de Thurocz1
- Johannes von Kastl1
- John Cleseby1
- John Eyr1
- John Frederick II of Saxony1
- John Gage1
- John Gower1
- John Herd1
- John Skyrrow1
- John Tiptoft, 1st Earl of Worcester1
- John de Mowbray, 2nd Baron Mowbray1
- John of Glastonbury1
- John of Ibelin1