Author
- Joannes Dominicus de Marchis1
- Johanna Hawkeslowe (Sr.)1
- Johannes Tostius1
- Johannes von Kastl1
- John Cleseby1
- John Eyr1
- John Frederick II of Saxony1
- John Gage1
- John Skyrrow1
- John de Mowbray, 2nd Baron Mowbray1
- John of Glastonbury1
- John of Ibelin1
- John of Lancaster, 1st Duke of Bedford1
- John, Duke of Berry1
- Joseph Yitzchak Hakohen Poppers1
- Joshua Benzion Segre1
- José Romero de Tejada y Artacho1
- João Gomes da Silva1
- Juan Alvarez1
- Juan Antonio de Hozes Sarmiento1