According to royalblog.nl the the Liechtenstein Museum in Vienna, property of the Liechtenstein family, bought a painting of Friedrich von Amerling. Von Amerling is the most important portrait painter of the Biedermaier style. The painting was estimated to sell for 250.000 to 350.000 euros but the family bought it for 1.5 million.
Article in Dutch
here.
And the painting
here.