Author
- Hibat Allāh ibn Salāmah1
- Hugh of Fouilloy1
- Hugh of Saint Victor1
- Ibn 'Ata Allah1
- Ibn Battah1
- Ibn Daqiq al-Eid1
- Ibn Jumay‘1
- Ibn Khalawayh1
- Ibn Taymiyyah1
- Ibn al-Dubaythi1
- Ibn al-Farid1
- Ibn al-Khabbaz1
- Ibn al-Nafis1
- Ibn-al-Anbārī1
- Ildibrandinus1
- Innocent IV1
- Isidore of Seville1
- Izz al-Din ibn 'Abd al-Salam1
- Jacobus de Voragine1
- Johannes de Sacrobosco1