- Christian saints--Legends1
- Christian women--Conduct of life1
- Church calendar1
- Church history--Middle Ages1
- Church history--Sources1
- Church property1
- Church year sermons1
- Cicero, Marcus Tullius1
- Cicero, Marcus Tullius. De finibus bonorum et malorum1
- Cities and towns, Ancient1
- City planning1
- Civil procedure1
- Clare, of Assisi, Saint, 1194-12531
- Clement VIII, Pope, 1536-16051
- Clinical medicine1
- Codices (bound manuscripts)1
- Comedy plays1
- Confession--Catholic Church--Handbooks, manuals, etc--Early works to 18001
- Consolation1
- Conspiracy of Catiline (Rome : 65-62 B.C.)1