Author
- Hugh of Balma1
- Hugh of Saint Victor1
- Hugo Trottus1
- Ildibrandinus1
- Innocent III1
- Innocent IV1
- Inquisition Sicily)1
- Ippolito Libri1
- Isaiah di Trani1
- Isidore of Seville1
- Jabir ibn Hayyan1
- Jacob Saphir1
- Jacopo Piccolomini-Ammannati1
- Jacopone da Todi1
- Jacques de Vitry1
- James of Milan1
- Jean de Roquetaillade1
- Jean-François Roussin1
- Jewish Community of Padua, Italy1
- Jewish Community of Pitigliano, Italy1