Author
- Ippolito Libri1
- Jacob Saphir1
- Jacobus de Cessolis1
- Jacopone da Todi1
- Jacques de Vitry1
- Jaghmini1
- Jalal Al-Din Al-Khabazi1
- Jean Froissart1
- Jean Marot1
- Jean de Wavrin1
- Jerónimo Román y Zamora1
- Jewish Community of Amsterdam, Netherlands1
- Jewish Community of Padua, Italy1
- Joannes de Crivelli1
- Johannes de Thurocz1
- John Gower1
- John Herd1
- John Tiptoft, 1st Earl of Worcester1
- John Dokeianos1
- Juan López Ossorio1