"Luise Prinzessin von Schleswig-Holstein-Sonderburg-Beck was born on 28 September 1783. She was the daughter of Friedrich Karl Herzog von Schleswig-Holstein-Sonderburg-Beck and Friederike Amalie Gräfin von Schlieben. ...
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She married unknown Herzog von Anhalt-Köthen, son of Friedrich Erdmann von Anhalt-Köthen and Luise Gräfin von Stolberg-Wernigerode, on 20 August 1803. She died on 24 November 1803 at age 20.
Luise Prinzessin von Schleswig-Holstein-Sonderburg-Beck gained the title of Prinzessin Louise von Schleswig-Holstein-Sonderburg-Beck."
(http://thepeerage.com/p551.htm#i5508)
