 In 1269, 1272 and 1282 they gradually divided their governing competences within the then three territorially unconnected Saxon areas (Hadeln, Lauenburg and Wittenberg), thus preparing a partition, whereby Albert II, Burgrave of Magdeburg since 1269, concentrated on the Wittenberg territory.He consolidated his position by marrying Agnes, daughter of Rudolph of Habsburg, whom he elected King of the Romans in 1273.After Duke John I had resigned in 1282 in favour of his three minor sons Eric I, John II and Albert III, followed by his death three years later, the three brothers and their uncle Albert II continued the joint rule as Saxon dukes.