Author
- Guido delle Colonne1
- Haimo of Auxerre1
- Haymo of Faversham1
- Hermes Trismegistus1
- Hugh Ripelin of Strasburg1
- Hugh of Fouilloy1
- Hugh of Saint Victor1
- Hugh of Saint-Cher1
- Iacopo Bracciolini1
- Iacopo da Benevento1
- Innocent III1
- Innocent IV1
- Innocent XI1
- Jabir ibn Hayyan1
- Jacobus de Cessolis1
- Jacopo Ragone1
- Jacopone da Todi1
- Jacques de Vitry1
- James of Viterbo1
- Jean de Roquetaillade1