Author
- Isaac ben Joseph of Corbeil1
- Ismail al-Isfahani1
- Ismail ibn Hammad al-Jawhari1
- Ismāʻīl ibn Aḥmad Ibn al-Athīr1
- Izz al-Din ibn Hibatullah ibn Abi l-Hadid1
- Jaghmini1
- Jalāl al-Dīn al-Thīrī1
- James of Viterbo1
- Jamāl al-Dīn Aḥmad ibn Muḥammad Ẓāhirī1
- Jamāl al-Dīn Ḥaṣīrī1
- John Larry England1
- John XXII1
- Joseph ben Abraham Gikatilla1
- Joseph ben Judah ibn Aknin1
- Laurent d'Orleans1
- Malik ibn Anas1
- Maḥmūd ibn Abī Bakr Faraḍī1
- Michael Glycas1
- Mordechai ben Hillel1
- Moses ben Jacob of Coucy1