- Christian pilgrims and pilgrimages3
- Christian saints3
- Circumcision--Religious aspects--Judaism3
- Civilization3
- Clare, of Assisi, Saint, 1194-12533
- Colonies3
- Concini, Giovanbattista3
- Conduct of life3
- Corvus3
- Cosimo I, Grand-Duke of Tuscany, 1519-15743
- Cosmology3
- Counter-Reformation3
- Creation (Islam)3
- De anima (Aristotle)3
- De' Medici, Luigi, principe di Ottaviano, 1759-18303
- Deadly sins3
- Death--Religious aspects--Catholic Church3
- Death--Religious aspects--Islam3
- Demonology3
- Devotional poetry, Arabic3