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In page Elisabeth of Brandenburg, Duchess of Brunswick-Calenberg-Göttingen:

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She had to watch with horror when her son Eric II in 1557 married her youngest daughter, the Lutheran Catherine, to the Catholic High Burgrave William of Rosenberg, to provide for her economically. When Elisabeth completed the difficult journey to Münden to attend the wedding, she found that Eric had deliberately given her the wrong date and that the marriage had taken place some time earlier.[1] After the announcement of the marriage contract, Elisabeth was surprised to learn that Catherine would retain her Lutheran faith and would employ her own Lutheran pastor at court.[citation needed]