Author
- House of Borgia1
- House of Ventimiglia1
- House of della Rovere1
- Hugh Bigod, 3rd Earl of Norfolk1
- Hugh Talemache1
- Hugo Trottus1
- Humphrey Wellys1
- Iachetus Italianus1
- Iacopo Bracciolini1
- Iacopo da Benevento1
- Ildibrandinus1
- Imbert Feutrier1
- Immanuel Tremellius1
- Innocent XI1
- Iohannes de Ianna1
- Isaac Israeli ben Solomon1
- Isaac Newton1
- Jacobo Bellenden1
- Jacobus Balbi1
- Jacobus Dinetus1