Mona von Bismarck was married 5 times. Her third husband was one of the wealthiest men in the world, Harrison Williams, and her fourth husband was Count Albrecht Edzard von Bismarck-Schönhausen, a grandson of German Chancellor Otto von Bismarck.
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Von Bismarck also owned a property in Palm Beach, Florida, called Blythedunes. The home was demolished in 1988 and a home, Maison de L'Amitie, was built in it's place and has since been demolished and the land subdivided into three separate lots.