Author
- Jean de Roquetaillade2
- Johann Herolt2
- Johannes Nider2
- John Burgh2
- John Cassian2
- John Halgren of Abbeville2
- John Wycliffe2
- John XXII2
- John of Genoa2
- Jordan von Quedlinburg2
- Julian of Toledo2
- Julianus Pomerius2
- Justin2
- Konrad von Brundelsheim2
- Leo X2
- Leonardo Loredan2
- Lorenzo Valla2
- Lucian of Samosata2
- Luke the Evangelist2
- Marcus Gavius Apicius2