Wilhelm Karl Prinz von Preussen

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Prussian Royalty
House of Hohenzollern
Wilhelm II
Grandchildren Prince Wilhelm Prince Louis Ferdinand Prince Hubertus Prince Frederick Prince Alexander Ferdinand Princess Alexandrine Prince Oskar Princess Victoria Marina Prince Karl Franz Prince Burchard Princess Cecilie Princess Victoria Marina Herzeleide, Princess of Courland Prince Wilhem Victor Prince Wilhelm-Karl
v t e

Wilhelm Karl Adalbert Erich Detloff Prinz von Preussen (30 January 1922, in

Wilhelm-Karl was the youngest of Prince Oskar of Prussia and Countess Ina Marie von Bassewitz's four children.^[1] Having been admitted to the Bailiwick of Brandenburg of the Order of Saint John of the Hospital at Jerusalem (known unofficially as the Johanniterorden, the Protestant successor of the mediaeval Knights Hospitaller) in 1944, he later succeeded his father as its head, serving as the thirty-sixth Herrenmeister ("Master of the Knights") of the Order from 1958 until 1999. Wilhelm-Karl worked tirelessly^{[citation needed]} to keep the Order intact during the Cold War and helped to reunite its membership after the fall of East Germany.

Amongst other orders and awards, Wilhelm-Karl received the Grand Merit Cross (with star) of the

In 1952, Wilhelm-Karl married Armgard Else Helene von Veltheim (17 February 1926 - 1 November 2019), daughter of Friedrich von Veltheim (1881-1955) and his wife, Ottonie von Alvensleben (1883-1960). The couple had two sons and a daughter:^[1]

• Donata-Viktoria Prinzessin von Preussen (born 24 December 1952).
• Wilhelm-Karl Prinz von Preussen (born 25 August 1955).
• Oskar Prinz von Preussen
  (born 6 May 1959); historian, succeeded his father as the Master of the Knights of the Johanniterorden, he married Auguste Zimmermann von Siefart (born 16 May 1962), daughter of Ralf Emil Eberhard Jules Henning Zimmermann von Siefart (b. 1925) and Maria Ida Barbara Helene von Frankenberg und Proschlitz (b. 1930). The couple has two sons and a daughter.

Published works

• Auftrag des Johanniters. Ansprachen und Aufsätze ("Transactions of the Johanniter Knights: Talks and Treatises"); 1983.
• Johanniter und der 20. Juli 1944 ("Johanniter Knights and the Plot of July 20, 1944", written with
  Lieutenant General Bernd, Baron Freytag von Loringhoven
  ); 1989 (second edition).
• Die Soldaten der Wehrmacht ("The Soldiers of the Wehrmacht", written with Karl-Günther von Hase and Hans Poeppel), 1998 (sixth edition, 2000). (
  ISBN 3-7766-2057-9
  )