- Cappuccini Cannobio (1569-?) Previous Owner
- Cappuccini Locarno (1602-1852) Previous Owner
- Carnahan, June (d. 2009) Previous Owner
- Casati, Giulio (16. sec.) Previous Owner
- Celotti, Luigi 1789-1846 Previous Owner
- Cerronetti, Battista Previous Owner
- Chalon, Renier, 1802-1889 Previous Owner
- Charles Eliot Norton, 1827-1908 Previous Owner
- Chester-le-Street St Mary and St Cuthbert Previous Owner
- Ciossi, Battista Previous Owner
- Cipariu, Timotei, 1805-1887 Previous Owner
- Cola, Giovanni Previous Owner
- Comesina, Domenico Previous Owner
- Conrad, Ulrich -1541 Previous Owner
- Constant Serrure, Belgian historian Previous Owner