"Elisabeth Christine of Brunswick-Wolfenbüttel-Bevern (8 November 1715 – 13 January 1797) was Queen of Prussia from 1740 to 1786 as the spouse of Frederick the Great. ...
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By birth, she was a Duchess of Brunswick-Wolfenbüttel. She was also the longest-serving queen of Prussia." - (en.wikipedia.org 08.11.2019)
