[1] He committed suicide by poison at the end of World War II, in Vienna, along with his daughter Maria and son-in-law Richard Eberstaller, a Viennese lawyer.

[5] Previously a smaller painting, a still-life entitled Speisezimmer I, from the Rau collection fetched 286,700 Euros at Lempertz, a world-record price for the artist.

[6] The Viennese auction house Dorotheum sold his painting "Blick auf Nussdorf und Heiligenstadt in der Dämmerung" for 228,839 Euros on 27 November 2007.

[8] It had been owned by Siegmund Isaias Zollschan of Vienna, who was murdered in the Holocaust; he had sent it to a relative in Canada for safekeeping before the war, where it remained in family hands until acquired by the gallery.

This rediscovered masterpiece was Freeman's highest selling lot to date, surpassing the house's 2011 record of $3.1m achieved by an important Imperial white jade seal from the Qianlong period.