Prince Wilhelm Friedrich Franz Joseph Christian Olaf of Prussia was the eldest child of Wilhelm, German Crown Prince, and Duchess Cecilie of Mecklenburg-Schwerin. Wikipedia
Born: July 4, 1906, Marmorpalais, Potsdam, Germany
Died: May 26, 1940 (age 33 years), Nivelles, Belgium
Children: Princess Felicitas of Prussia and Princess Christa of Prussia
Parents: Wilhelm, German Crown Prince
Spouse: Dorothea von Salviati (m. 1933–1940)
Siblings: Louis Ferdinand, Prince of Prussia