- Gellius, Aulus1
- Gregory I, Pope, approximately 540-6041
- Gregory, of Rimini, -13581
- Guainerio, Antonio, -14401
- Guarino, Veronese, 1374-14601
- Hugo, Argentinensis, approximately 1210-approximately 12701
- Hugo, de Prato Florido, -13221
- Ibn Ilyās, Manṣūr ibn Muḥammad, fl. 13841
- Ibn al-Ṭabarī, Shihāb al-Dīn Aḥmad1
- Iskandarānī, Saʻīd ibn Ḥasan, 14th cent1
- Iustinus1
- Ivani, Antonio, 1430-14821
- Jacobus, Mediolanensis, active 13th century1
- Jacobus, de Cessolis, active 1288-13221
- Jacobus, de Theramo, 1350 or 1351-14171
- Jami, 1414-1492, creator1
- Johannes, de Caulibus, 14th cent1
- John XXI, Pope, -12771
- Lactantius, approximately 240-approximately 3201
- Langland, William, 1330?-1400?1
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