Author
- Joannes Dominicus de Marchis1
- Joannes de Crivelli1
- Johanna Hawkeslowe (Sr.)1
- Johannes Tostius1
- Johannes von Kastl1
- John Cleseby1
- John Eyr1
- John Gage1
- John Gower1
- John Herd1
- John Tiptoft, 1st Earl of Worcester1
- John of Glastonbury1
- João Gomes da Silva1
- Juana I of Castile1
- Jörg Muelich1
- Kingdom of Naples1
- Leo X1
- Leonardo Loredan1
- Leonhard Freisleben1
- Louis Hélian1