"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, art collector, arts patron, and close friend of Beethoven, being the dedicatee of his "Diabelli" variations." - (en.wikipedia.org 12.08.2021)