Author
- Henry de Bracton1
- Hugh of Saint-Cher1
- Ibn Bardis1
- Ibn Manzur1
- Ibn al-Kharrāṭ1
- Ibn al-Salah1
- Ibn ʿAqīl1
- Innocent III1
- Isaac Alfasi1
- Isaac ben Joseph of Corbeil1
- Ismail al-Isfahani1
- Izz al-Din ibn Hibatullah ibn Abi l-Hadid1
- Jacob ben Asher1
- Jacobus de Cessolis1
- Jacopo Piccolomini-Ammannati1
- Jacques Lempereur1
- Jamāl al-Dīn Aḥmad ibn Muḥammad Ẓāhirī1
- Jamāl al-Dīn Ḥaṣīrī1
- Jean de Lignieres1
- John Gower1