Author
- Johannes von Kastl1
- John Chrysostom1
- John Eyr1
- John Frederick II of Saxony1
- John of Ibelin1
- John of Lancaster, 1st Duke of Bedford1
- John Dokeianos1
- John, Duke of Berry1
- Joshua Benzion Segre1
- Juana I of Castile1
- Judah Halevi1
- Khālid ibn ʻAbd Allāh al-Azharī1
- Kingdom of Naples1
- Kāśīnātha Upādhyāya1
- Laurent d'Orleans1
- Leo X1
- Leonhard Freisleben1
- Levi, Yosef, 18th century1
- Lope de Vega1
- Lorenzo Gondi1