Prince Frederick George William Christopher of Prussia (German: Friedrich Georg Wilhelm Christoph Prinz von Preußen; 19 December 1911 – 20 April 1966), also known as Friedrich von Preussen in the United Kingdom,[1] was the fourth son of Crown Prince Wilhelm of Germany and Duchess Cecilie of Mecklenburg-Schwerin.

They had five children:[2] 3rd Baron Brocket He was studying at Cambridge and lived incognito as the Count von Lingen when World War II broke out in September 1939.

[2] He was naturalised as a British citizen in October 1947 under the name Friedrich von Preussen (having also been known during residence in the UK as "George Mansfield").

[2] This naturalisation was controversial, in part because being a descendant of Sophia of Hanover, and having rights under the Act of Settlement 1701, as amended by the Sophia Naturalisation Act 1705, he had a claim to British citizenship from birth.

His status in context of his claim for compensation for property seized in Poland was debated in Parliament and the law courts until 1961.