Wer heiratete Princess Ortrud of Schleswig-Holstein-Sonderburg-Glücksburg?

Ernst August, Hereditary Prince of Brunswick, Prince of Hanover (German: Ernst August Prinz von Hannover; 18 March 1914 – 9 December 1987) was head of the House of Hanover from 1953 until his death in 1987. From his birth until the German Revolution of 1918–1919 he was the heir apparent to the Duchy of Brunswick, a state of the German Empire.

He was born at Braunschweig, Germany, the eldest son of Ernest Augustus, Duke of Brunswick and Princess Viktoria Luise of Prussia, the only daughter of Emperor Wilhelm II, Ernest Augustus's third cousin in descent from George III the United Kingdom. Ernst August's parents were, therefore, third cousins, once removed. From his birth, he was the Hereditary Prince of Brunswick. He was also, shortly after birth in 1914, made a British prince by King George V of the United Kingdom, and was heir to the titles Duke of Cumberland and Teviotdale and Earl of Armagh. His German titles were abolished in 1919 by the Weimar Republic, while the British peerages to whom he was heir were suspended under the Titles Deprivation Act 1917. Nonetheless, he held title of Prince of the United Kingdom of Great Britain and Ireland, granted ad personam to the children of the then-Duke of Brunswick by the letters patent of 1914, which remained unrevoked.