- Catherine, of Alexandria, Saint1
- Catherine, of Siena, Saint, 1347-13801
- Christian hagiography1
- Christian heresies1
- Christian heresies--Early church1
- Christian literature, Early1
- Christian martyrs1
- Christian saints--Biography1
- Christian saints--Legends1
- Christian women saints1
- Christian women--Conduct of life1
- Christianity and other religions1
- Church polity1
- Cistercians1
- Confession1
- Confession--Catholic Church1
- Cords1
- Criticism and interpretation1
- Cur Deus homo (Anselm, Saint, Archbishop of Canterbury)1
- De gradibus humilitatis et superbiae (Bernard, of Clairvaux, Saint)1