as the daughter of Albert Frederick, Duke of Prussia and Marie Eleonore of Cleves.
Duchess Anna of Prussia - Source picture: Wikipedia
As you can see on the picture, she wasn't known for her beauty but Anna
had certainly other qualities.
Anna wasn't only heir of Prussia but also of Cleves, Jülich, Berg, Mark and
So, she married John Sigismund, Elector of Brandenburg. They had 8 children.
Intellectually she was more superior to her husband.
She died on August 30th. 1649 in Berlin.