Author
- Gregory XI1
- Gregory de Chastellar1
- Guglielmo Perlano1
- Guido di Biagio di Carlo Piccolomini1
- Guillaume d'Estouteville1
- Haimo of Auxerre1
- Hesiod1
- House of Borgia1
- House of Requesens1
- House of Ventimiglia1
- Hugh Ripelin of Strasburg1
- Hugh of Balma1
- Hugh of Saint Victor1
- Hugo Trottus1
- Ildibrandinus1
- Innocent III1
- Innocent IV1
- Inquisition Sicily)1
- Ippolito Libri1
- Isaiah di Trani1