- Crusades (Fifth) (1218-1221)1
- Cryptography1
- Cults2
- Cur Deus homo (Anselm, Saint, Archbishop of Canterbury)1
- Customary law1
- Cynics (Greek philosophy)2
- Czech (culture or style)7
- Czech Republic7
- Czech Republic--Bohemia1
- Czech Republic--Brno1
- Dal Borgo family1
- Dalālat al-ḥāʼirīn (Maimonides, Moses)2
- Damages (Jewish law)1
- Dante Alighieri, 1265-13212
- Darius I, King of Persia, 548 B.C.-485 B.C.1
- Dates (Provenance)2
- Dati, Agostino, 1420-14781
- Dati, Jacopo1
- Dati, Niccolò, 1458-1500 or 15011
- Davanzati, Niccolò1