Head of the Princely House of Hohenzollern (1941-1951).
Children: Prince Wilhelm (1906-1940), Prinz Louis Ferdinand von Preussen, Prince Hubertus (1909-1950), Prince Frederick (1911-1966), Princess Alexandrine (1915-1980), and Princess Cecilie (1917-1975).
Mata Hari was recruited in 1916 by agents from the Deuxième Bureau to seduce him; the French believed mistakenly that he was a commander in his father's army.
Had he succeeded to the German Imperial throne, he would have used the reign name Wilhelm III.