Author
- Isidore of Seville1
- Iskandar Beg Munshi1
- Izz al-Din ibn Hibatullah ibn Abi l-Hadid1
- Jacobus de Cessolis1
- Jacobus de Voragine1
- Jacques Legrand1
- Jalaluddin al-Mahalli1
- Jean de Meun1
- Johannes Gherinx1
- John Cassian1
- John Lydgate1
- John of Howden1
- Julian of Toledo1
- Khaqani1
- Khushal Khan Khattak1
- Kirmānī, Muḥammad ibn ʻAlī1
- Leon Battista Alberti1
- Leonardo Mainardi1
- Ludovicus Valentia de Ferraria1
- Lydgate, John, 1370?-1451?1