- Companions of the Prophet Muhammad1
- Confession--Catholic Church1
- Contemporary bindings1
- Coptic Christian saints1
- Coptic manuscripts1
- Criticism and interpretation1
- Crusades (Second) (1147-1149)1
- Cyropaedia (Xenophon)1
- Cyrus, the Great, King of Persia, -530 B.C. or 529 B.C.1
- Death--Religious aspects--Islam1
- Death--Religious aspects--Islam--Qurʼanic teaching1
- Decorated edges1
- Devotional literature, English (Middle)1
- Devotional literature, Italian1
- Devotional literature, Latin (Medieval and modern)1
- Dialogi (Gregory I, Pope)1
- Digital images1
- Dion, approximately 408 B.C.-354 B.C.1
- Dionysius, the Areopagite, Saint, active 1st century1
- Discipline1