"Antonie Brentano (28 May 1780 in Vienna – 12 May 1869 in Frankfurt), born Johanna Antonie Josefa Edle von Birkenstock, known as Toni, was a philanthropist, ...
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art collector, arts patron, and close friend of Beethoven, being the dedicatee of his "Diabelli" variations." - (en.wikipedia.org 12.08.2021)