Author
- Henricus de Ratisbona1
- Henry of Langenstein1
- Hugh of Fouilloy1
- Hugh of Saint-Cher1
- Hâkî Mehmet Efendi1
- Ibn 'Abd al-Barr1
- Ibn ʻAbd al-Riḍá1
- Innocent III1
- Isidore of Seville1
- Iskandar Beg Munshi1
- Izz al-Din ibn Hibatullah ibn Abi l-Hadid1
- Jacobus de Cessolis1
- Jacobus de Voragine1
- Jacques Legrand1
- Jean de Meun1
- Johannes Gherinx1
- John Cassian1
- John Lydgate1
- John of Howden1
- Julian of Toledo1