Duke of Mecklenburg-Güstrow and Mecklenburg-Schwerin
John Albert I, in older literature known as John or Johann, was the reigning duke of Mecklenburg-Güstrow from 1547 to 1556 and of Mecklenburg-Schwerin from 1556 to 1576. In 1549, John Albert I saw to it that the parliament of Mecklenburg carried through the Reformation for the entire duchy.
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