John Albert I, Duke of Mecklenburg duke of Mecklenburg-Güstrow and Mecklenburg-Schwerin (1525–1576) Parents Anna of Brandenburg Albrecht VII, Duke of Mecklenburg Children Sigismund Augustus of Mecklenburg-Schwerin Johann VII, Duke of Mecklenburg Siblings Charles I Ulrich, Duke of Mecklenburg Christopher, Duke of Mecklenburg Georg von Mecklenburg Anna of Mecklenburg Partners Anna Sophie of Prussia
