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
Anna of Brandenburg, Duchess of Mecklenburg
…Magnus (1524-1524) John Albert I (1525–1576), Duke of Mecklenburg, married in 1555 Princess Anna Sophia of Prussia (1527–1591) Ulrich III (1527–1603), Duke of Mecklenburg, married in…
Portrait by Peter Boeckel, 1574
Reformation and Court Order' of 1568 by John Albert I