- Hoccleve, Thomas, 1370?-1450?1
- Hugh, of Saint-Cher, Cardinal, approximately 1200-1263.1
- Iacobus, of Speyer.1
- Innocent III, Pope, 1160 or 1161-1216.1
- Innocent VII, Pope, 1336-1406.1
- Isidore, of Seville, Saint, -636.1
- Jacobus, Mediolanensis, active 13th century.1
- Jacobus, de Gruytrode, active 1440-1475.1
- Jacobus, de Voragine, approximately 1229-1298.1
- Jacopone, da Todi, 1230-1306.1
- Jacquemart, de Hesdin, active 1380-1411.1
- Jacques, de Longuyon, active 1290-1312.1
- Jacques, de Vitry, approximately 1170-1240.1
- Jean, de Meun, approximately 1240-approximately 1305.1
- Joachim, of Fiore, approximately 1132-1202.1
- John, of Wales, -approximately 1285.1
- John, the Apostle, Saint.1
- Justinus, Marcus Junianus.1
- Lactantius, approximately 240-approximately 320.1
- Lactantius, ca. 240-ca. 320.1
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