Author
- Guillaume de Rennes1
- Heinrich IV. von Württemberg1
- Hibat Allāh ibn Salāmah1
- Hugh Bigod, 3rd Earl of Norfolk1
- Hugh of Fouilloy1
- Hugh of Saint Victor1
- Husam al-Din al-Hajiri1
- Ibn Abi al-Isbaʻ1
- Ibn Battah1
- Ibn Daqiq al-Eid1
- Ibn Duraid1
- Ibn Jumay‘1
- Ibn Khalawayh1
- Ibn Taymiyyah1
- Ibn al-Ajdābī1
- Ibn al-Nafis1
- Ildibrandinus1
- Innocent IV1
- Isidore of Seville1
- Izz al-Din ibn 'Abd al-Salam1