Author
- Hugh of Fouilloy1
- Ildibrandinus1
- Immanuel Bonfils1
- Innocent III1
- Jacopo Nannis de Piccolomini1
- Jacques de Vitry1
- Jami1
- Jean Bénard1
- Jean Dupin1
- Jean Germain1
- Jean de Wavrin1
- Jean-François Roussin1
- Joan Martines1
- John Burgh1
- John Capgrave1
- John Cassian1
- John Tiptoft, 1st Earl of Worcester1
- Joseph Haslewood1
- João Freire1
- Julian of Toledo1