Author
- John Mandeville1
- John Montgomery1
- John Scottowe1
- John Skyrrow1
- John de Beauchesne1
- John de Mowbray, 2nd Baron Mowbray1
- John of Glastonbury1
- John of Ibelin1
- John of Lancaster, 1st Duke of Bedford1
- John of Wales1
- John, Duke of Berry1
- Joseph Angelet1
- Joseph Yitzchak Hakohen Poppers1
- Joseph ben Gorion1
- Joshua Benzion Segre1
- José Antonio de Alzate y Ramírez1
- José Romero de Tejada y Artacho1
- João Freire1
- João Gomes da Silva1
- Juan Alvarez1