Magnus Torquatus had already died in 1373, so the treaty between the two contending houses was further reinforced by the marriage of his two eldest sons, Frederick and Bernard I, to the two daughters of Wenceslas and by the marriage of Magnus's widow to Albert of Saxe-Wittenberg. The younger brother of Frederick and Bernard, Henry the Mild refused, however, to accept the agreement and continued to prosecute the war. It was not until after the Battle of Winsen in 1388, when Wenceslas lost his life, that the Wittenbergs gave up their claims and the principality was finally secured by the Welfs.