Author
- Iacobo Cattaneo Lagomarsino1
- Iacopo Bracciolini1
- Iacopo da Benevento1
- Immanuel Bonfils1
- Isaac of Troki1
- Isidore of Seville1
- Jacob ben Hayyim Zemah1
- Jacob ben Jacob, ha-Kohen, -approximately 12701
- Jacobus de Voragine1
- Jacopo Ragone1
- Jerome1
- Jewish prayers1
- John Chrysostom1
- Joseph Angelet1
- Joseph ben Abraham Gikatilla1
- Joshua Benzion Segre1
- Kalonymus ben Kalonymus1
- Konrad III. von Soltau1
- Levi, Yosef, 18th century1
- Leʼon di Belentish1