Author
- Ibn Kathir1
- Ibn Luyun1
- Ibn Said al-Maghribi1
- Ibn Taymiyyah1
- Ibn al-Farid1
- Ibn al-Nafis1
- Ibn ʿAqīl1
- Ibn-al-ʿAṭṭār, ʿAlī Ibn-Ibrāhīm1
- Ibrāhīm ibn Muḥammad Aʻlam al-Baṭalyawsī1
- Ismāʻīl ibn Aḥmad Ibn al-Athīr1
- Jacob ben Asher1
- Jacobus de Burgo1
- Jacopone da Todi1
- Jaghmini1
- Jalal al-Din al-Qazwini1
- Jalaluddin al-Mahalli1
- John Wycliffe1
- Joseph ben Abraham Gikatilla1
- Kamāl al-Dīn Turkumānī1
- Konrad III. von Soltau1