Author
- Giuseppe Vella1
- Gregorio Dati1
- Guglielmo Perlano1
- Haymo of Faversham1
- Hermes Trismegistus1
- Hieronymus de Viterbo1
- Horace1
- Hugh of Balma1
- Hugh of Saint Victor1
- Hugh of Saint-Cher1
- Iacopo Bracciolini1
- Iacopo da Benevento1
- Innocent III1
- Innocent XI1
- Isaac Alfasi1
- Isaac Israeli ben Joseph1
- Isaac of Troki1
- Isidore of Seville1
- Israel Sarug1
- Jabir ibn Hayyan1