- Columbus, Christopher1
- Commercial law1
- Common law1
- Compasses (Mathematical instruments)1
- Complaint letters1
- Concini family1
- Concini, Alessandra Antinori1
- Concini, Arrigo1
- Concini, Giovanbattista1
- Concubinage1
- Congregazione di San Giorgio in Alga (Venice, Italy)1
- Congregação di San João Evangelista (Portugal)1
- Conquest of Peru (Peru : 1522-1548)1
- Constantine XI Palaeologus, Emperor of the East, 1405-14531
- Construction industry1
- Controversial literature1
- Convento de la Concepción (Granada, Spain)1
- Costa, Gaspar, active 1533-15341
- Costapellegrina, Giovan Andrea1
- Council of Trent1