Author
- Gregory I1
- Gregory of Nicomedia1
- Guanding1
- Haimo of Auxerre1
- Hayashi Shihei1
- Hunayn ibn Ishaq1
- Ibrāhīm al-Ḥalabī1
- Immanuel Bonfils1
- Isaac of Troki1
- Isaac the Blind1
- Isidore of Seville1
- Israel Alnaqua1
- Issachar ben Mordecai ibn Susan1
- Jacob Berab1
- Jacob ben Asher1
- Jacob ben Jacob, ha-Kohen, -approximately 12701
- Jacob ibn Habib1
- James of Lausanne1
- Jerome1
- Joachim Heinrich Campe1