Author
- Ibn al-Qasim1
- Igreja e Convento de Santa Maria de Aguiar1
- Ildibrandinus1
- Innocent VIII1
- Isaac Israeli ben Joseph1
- Isaac Israeli ben Solomon1
- Isaac ben Joseph of Corbeil1
- Isaiah di Trani1
- Jacob ben Jacob, ha-Kohen, -approximately 12701
- Jacob of Serugh1
- Jacobo Bellenden1
- Jacobus Balbi1
- Jacomo Veronese1
- Jacopo Nannis de Piccolomini1
- Jacopo Piccolomini-Ammannati1
- Jacopone da Todi1
- Jacques Bruyant1
- Jacques Lempereur1
- Jacques de Vitry1
- James of Viterbo1