Claim: The Portrait of Frederick II of Prussia was commissioned by Frederick's sister, Duchess Philippine Charlotte (born March 1716) was last displayed in the Lower Saxony State Museum..
Evidence: It was commissioned by Frederick's sister Duchess Philippine Charlotte of Brunswick-Wolfenbüttel. Princess Philippine Charlotte of Prussia (German: Philippine Charlotte von Preußen) (13 March 1716, in Berlin – 17 February 1801, in Brunswick) was a Duchess consort of Brunswick-Wolfenbüttel by marriage to Charles I of Brunswick-Wolfenbüttel and a known intellectual in contemporary Germany. On 10 October 2009 the painting, last put on public display in 1937 at the Lower Saxony State Museum, was offered by the Bremer auction house Bolland & Marotz and sold at a price of 670,000 euros.