- Son of Kaiser Wilhelm II and Empress Augusta Victoria.
- Brother-in-law of Großherzog Friedrich Franz IV von Mecklenburg-Schwerin and Dronning Alexandrine.
- 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).
- Grandfather of Prinz Louis Ferdinand Junior von Preussen, Friedrich Wilhelm Prinz von Preußen, and Prinz Michael von Preussen. Great-grandfather of Georg Friedrich von Preußen, Prinzessin Nataly von Preussen, and Prinzessin Micaela von Preussen.
- Brother of Viktoria Luise von Preußen.
- Nephew of Prince Henry of Prussia.
- 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.
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