John II, Duke of Saxe-Lauenburg

John II and his brothers at first jointly ruled Saxe-Lauenburg, before they partitioned it into three parts, while the exclave Land of Hadeln remained a trilateral condominium.

John II then held Mölln, parts of the Sachsenwald (Saxon Wood) and the Land of Ratzeburg west of the river Stecknitz.

Being the eldest brother, John II successfully officiated as Saxon prince-elector, a privilege disputed between the duchies of Saxe-Lauenburg and Saxe-Wittenberg.

In 1314, John II participated in the election of the German king and the antiking, the Wittelsbachian Louis IV the Bavarian, and his Habsburg cousin Frederick III, the Fair.

Frederick the Fair received in the same election four of the seven votes, with the deposed King-Elector Henry of Bohemia illegitimately assuming electoral power, Archbishop-Elector Henry II of Cologne, Louis's brother Prince-Elector Rudolph I of the Electorate of the Palatinate, and Duke Rudolph I of Saxe-Wittenberg, John's cousin and rival in claiming the Saxon prince-electoral power.