Wilhelm; Prince of Prussia; eldest son of Wilhelm; Crown Prince of the German Reich; and Cecilie zu Mecklenburg-Schwerin; Potsdam 4. 7. 1906 - Nivelles 26. 5. 1940.- "The children of the crown prince couple". -(Prince William of Prussia with his brothers Louis Ferdinand; 1907-1994; Hubertus; 1909-1950; Friedrich; 1911-1966; and the sister Alexandrine; 1915-1980)).Photo by Franz Arndt; Gdansk-Langfuhr. Edited as a postcard by Neue Photographische Gesellschaft; Berlin-Steglitz (c. 1916).Private collection.