Author
- Gwenllian of Wales1
- Herbert of Auxerre1
- Honorius1
- Hugh Ripelin of Strasburg1
- Hugh of Balma1
- Hugh of Saint-Cher1
- Iacopo da Benevento1
- Innocent I1
- Innocent III1
- Isidore of Seville1
- Jacobus de Burgo1
- Jacomo Veronese1
- Jacques Legrand1
- James of Lausanne1
- Jerome1
- Johannes Nider1
- Johannis Hieronymus1
- John Koukouzeles1
- John Versor1
- John Zonaras1