- Innocent III, Pope, 1160 or 1161-12161
- Institoris, Heinrich, 1430-15051
- Isocrates1
- Isocrates. To Demonicus1
- Isocrates. To Nicocles1
- Jacobus, de Clusa, 1381?-14651
- Jacobus, de Forlivio, -14131
- Jean, de Tournemire, approximately 1330-approximately 13961
- Jerome, Saint, -419 or 420, author1
- John of Wales, fl. 1260.1
- Juvenal. 14741
- Ketham, Joannes de, active 15th century1
- Lactantius, approximately 240-approximately 3201
- Lazzarelli, Ludovico, 1450-1500, author1
- Lefèvre, Raoul, active 1460.1
- Legrand, Jacques, approximately 1365-14151
- Leonardus, de Utino, active 15th century, author1
- Levi ben Gershom, 1288-1344.1
- Lydgate, John, 1370?-1451?1
- Macer, Floridus1
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