- Circumcision--Religious aspects--Judaism3
- Cities and towns3
- Civilization3
- Clare, of Assisi, Saint, 1194-12533
- Colonies3
- Command of troops3
- Concini, Giovanbattista3
- Corvus3
- Cosimo I, Grand-Duke of Tuscany, 1519-15743
- Cosmology3
- Counter-Reformation3
- Dawwānī, Muḥammad ibn Asʻad, 1426 or 1427-1512 or 1513. Zawrāʼ3
- Dayrūṭī, Muḥammad ibn Aḥmad, -1515 or 1516. Dimyāṭīyah3
- De' Medici, Luigi, principe di Ottaviano, 1759-18303
- Deadly sins3
- Death--Religious aspects--Catholic Church3
- Demonology3
- Dhimmis (Islamic law)3
- Discoveries in geography3
- Divine office3