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In page Maria Eleonora of Brandenburg:

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The new Elector, George William, who resided in Prussia, was appalled when he heard of his mother's independent action. He wrote to Gustavus Adolphus to refuse his consent to the marriage until Sweden and Poland had settled their differences. It was the Electress Dowager, however, who, in accordance with Hohenzollern family custom, had the last word in bestowing her daughter's hand in marriage. She sent Maria Eleonora to territory outside of George William's reach and concluded the marriage negotiations herself.[citation needed]