- Horses1
- Human reproduction1
- Hussites1
- Hymns1
- Hypothesis1
- Ildobrandini, Geronimo1
- Illumination of books and manuscripts, Carolingian1
- Illumination of books and manuscripts, French1
- Illumination of books and manuscripts, Gothic1
- Illumination of books and manuscripts--Technique1
- In Coena Domini bulls1
- Indulgences1
- Indulgences (Canon law)1
- Influence (Literary, artistic, etc.)1
- Inheritance and succession (Canon law)1
- Inheritance and succession (Roman law)1
- Innocent IV, Pope, approximately 1200-12541
- Innocent VIII, Pope, 1432-14921
- Institutiones oratoriae (Quintilian)1
- Intellectual life1