Author
- Hugh Bigod, 3rd Earl of Norfolk1
- Hugh of Fouilloy1
- Hugh of Saint Victor1
- Ibn Abi al-Isbaʻ1
- Ibn Battah1
- Ibn Khalawayh1
- Ibn Malik1
- Ibn Taymiyyah1
- Ibn al-Ajdābī1
- Ibn al-Dubaythi1
- Ibn al-Khabbaz1
- Isaac ben Joseph of Corbeil1
- Isidore of Seville1
- Ismāʻīl ibn Aḥmad Ibn al-Athīr1
- Jacobus de Voragine1
- Jaghmini1
- Jalal Al-Din Al-Khabazi1
- Johannes de Sacrobosco1
- John Chrysostom1
- John de Breton1