- Inner Light1
- Innocent III, Pope, 1160 or 1161-12161
- Innocent V, Pope, approximately 1224-12761
- Innocent VIII, Pope, 1432-14921
- Insular scripts1
- Introductions1
- Investiture1
- Iraq1
- 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
- Israel--Tsefat1
- Italian literature--Societies, etc.1
- Italy--Abbiategrasso1
- Italy--Ameglia1
- Italy--Ancona1
- Italy--Arezzo1
- Italy--Arezzo (Province)1