John was of weak health and had gone blind in young years, therefore he was considered inferior among his brothers. John II's father John I resigned from dukedom in 1282 in favour of his three minor sons Albert III, Eric I, and John II. However, their uncle Albert II fostered them. John II and his brothers came to age and joint the government. The last document, mentioning the brothers and their uncle Albert II as Saxon fellow dukes dates back to 1295. The definite partitioning of Saxony into Saxe-Lauenburg, jointly ruled by John II and his brothers and Saxe-Wittenberg, ruled by their uncle Albert II, took place before 20 September 1296, when the Vierlande, Sadelbande, the Land of Ratzeburg, the Land of Darzing, and the Land of Hadeln are mentioned as the separate territory of the brothers. Albert II received Saxe-Wittenberg around the eponymous city and Belzig. 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 and the Land of Ratzeburg west of the riverStecknitz. In 1321 he further gained Bergedorf - with its castle - from his brother Eric I, who had earlier inherited the share of the Albert III already deceased in 1308. John II's branch duchy thus became known as Saxe-Bergedorf-Mölln. Being the eldest brother John II officiated successfully 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 antiking, the Wittelsbachian Louis IVthe Bavarian and his Habsburg cousin Frederick III, the Fair. Louis received five of the seven votes, to wit that of Duke John II, rivallingly claiming the Saxon prince-electoral power, Archbishop-Elector Baldwin of Trier, the legitimate King-Elector John of Bohemia, Archbishop-Elector Peter of Mainz, and Prince-Elector Waldemar of Brandenburg. 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 rivallingly claiming the Saxon prince-electoral power. However, Louis prevailed as German king.
