"The Russian inspired headdress in this portrait, reminiscent of that worn in one of the 367 portraits lining the walls of a salon in the Peterhof Palace, Saint Petersburg (inv. no. 880), suggests this portrait was completed in Russia in the last decade of the artist's life. " http://www.sothebys.com/en/auctions/ecatalogue/2013/old-master-paintings-n09003/lot.63.html