Author
- Johannes Mellarinus1
- Johannes Nider1
- Johannes Tostius1
- Johannes von Kastl1
- Johannis Hieronymus1
- John Burgh1
- John Cornelius1
- John Felton1
- John Versor1
- John XXI1
- John Zonaras1
- Josephus1
- Juan Valenzuela Velázquez1
- Juan de Torquemada1
- Konrad III. von Soltau1
- Laurentius Cynthius1
- Leonardo Loredan1
- Leonhard Freisleben1
- Lorenzo Pucci1
- Louis Hélian1