- Jābir ibn Ḥayyān1
- Jighmīnī, Maḥmūd ibn Muḥammad, d. 1221? Mulakhkhaṣ fī al-hayʾah1
- John, of Wales, 13th cent1
- Johnson, John Mordaunt, 1776?-18151
- Khālid ibn Yazīd al-Umawī, 7th cent1
- León, Alonso de, ca. 1610-16611
- Llull, Ramon, 1232?-13161
- Maqqarī, Aḥmad ibn Muḥammad, d. 1631 or 21
- Martin Roesel of Rosenthal1
- Miksche, Michael1
- Murphy, Gerald, 1888-19641
- Petrarca, Francesco, 1304-13741
- Qāḍīʹzādah, Mūsá ibn Muḥammad, d. ca. 14361
- Rāzī, Abū Bakr Muḥammad ibn Zakarīyā, 865?-925?1
- Richard, de Fournival, fl. 1246-12601
- Ruysbroeck, Willem van, ca. 1210-ca. 12701
- Salimbeni, Jacopo, d. ca. 14271
- Strang, James Jesse, 1813-18561
- Thomas, Aquinas, Saint, 1225?-12741
- Vincent, of Beauvais, d. 12641