Former Owner
- Mary Schell Collins1
- Matteo Barresi1
- Matteo Luigi Canonici1
- Melk Abbey1
- Michel Chasles1
- Michel de Léon1
- Monasterio de El Paular1
- Nicolas Antoine Labbey de Billy1
- Nicolas Fowle1
- Otto Ege1
- Otto Jahn1
- Otto Orren Fisher1
- Otto Vollbehr1
- Paland, Irmengarde von1
- Pangracius Chrewczer1
- Paolo Gallo1
- Paul Grinke1
- Petrus Giraud1
- Philip Kerr, 11th Marquess of Lothian1
- Philip Robinson1