- Illumination of books and manuscripts, Renaissance1
- Immortality1
- Immortality--Christianity1
- India--Goa (State)1
- Indulgences1
- Inner Light1
- Innocent III, Pope, 1160 or 1161-12161
- Innocent V, Pope, approximately 1224-12761
- Inquisition1
- Insular scripts1
- International relations1
- Introductions1
- Isabel, of Coimbra, Queen, consort of Afonso V, King of Portugal, 1432-14551
- Isagoge (Porphyry)1
- Isaiah (Biblical prophet)1
- Isidore, of Seville, Saint, -6361
- Islam1
- Italian literature--Societies, etc.1
- Italy--Assisi1
- Italy--Bergamo1