"Princess Adelheid Amalie Gallitzin (also known as Amaliia Samuilovna Golitsyna or in Russian as Амалия Самуиловна Голицына; 28 August 1748 – 17 April 1806) was the ...
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daughter of the Prussian Field Marshal Count Samuel von Schmettau and the mother of Prince Demetrius Augustine Gallitzin." - (en.wikipedia.org 05.11.2019)