Author
- John of Ibelin1
- John of Lancaster, 1st Duke of Bedford1
- John Dokeianos1
- John, Duke of Berry1
- Joshua Benzion Segre1
- João Gomes da Silva1
- Juan Félix de Rújula1
- Juan Ortiz Campoy1
- Juan de Zumárraga1
- Judah Halevi1
- Jörg Muelich1
- Karakaşzade Ömer1
- Khalīl ibn Shāhīn1
- Kingdom of France1
- Kingdom of Naples1
- Kāśīnātha Upādhyāya1
- Laurent d'Orleans1
- Leo X1
- Leonardo Loredan1
- Leonhard Freisleben1