Author
- House of Requesens1
- House of Ventimiglia1
- Hugh Ripelin of Strasburg1
- Hugh of Balma1
- Hugo Trottus1
- Ildibrandinus1
- Innocent III1
- Innocent IV1
- Isidore of Seville1
- Jacobus de Voragine1
- Jacopo Piccolomini-Ammannati1
- Jacopone da Todi1
- Jacques de Vitry1
- James of Milan1
- Jean-François Roussin1
- Jewish Community of Pitigliano, Italy1
- Joan Martines1
- Joannes Dominicus de Marchis1
- Joannes Oliva1
- John Wycliffe1