"Elisabeth Christine of Brunswick-Wolfenbüttel (28 August 1691 – 21 December 1750) was Princess of Brunswick-Wolfenbüttel, Holy Roman Empress, German Queen, Queen of Bohemia and Hungary; and ...
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Archduchess of Austria by her marriage to Emperor Charles VI. She was renowned for her delicate beauty and also for being the mother of Empress Maria Theresa. She was the longest serving Holy Roman Empress." - (en.wikipedia.org 09.10.2020)