Former Owner
- Conradus Eerens1
- Constance de Foix1
- Convent San Marco1
- Convento di San Giusto alle Mura1
- Convento di San Paolo1
- Coppo family1
- Cornelius John Hauck1
- Cosimo de' Medici1
- Count Alexis de Golowkin1
- Couvent des Minimes (Clermont-Tonnerre, France)1
- Craven Ord1
- Cristoferus Chrewczer1
- Curt H. Reisinger1
- D'Assonleville family1
- Dame Margery Byrkenhed1
- Dana Hill1
- Daniele Florio1
- David Eugene Smith1
- David McRoberts1
- David Swan1