"Duke John Albert of Mecklenburg (German: Herzog Johann Albrecht zu Mecklenburg; given names John Albert Ernest Constantine Frederick Henry; 8 December 1857 – 16 February 1920) ...
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was a member of the House of Mecklenburg-Schwerin who served as the regent of two states of the German Empire. He was first regent of the Grand Duchy of Mecklenburg-Schwerin from 1897 to 1901 for his cousin Frederick Francis IV, Grand Duke of Mecklenburg, and thereafter regent of the Duchy of Brunswick from 1907 to 1913." - (en.wikipedia.org 12.05.2022)
