Why did Louis IV arrange the marriage of Margaret of Tirol and his son Louis of Brandenburg?

Louis IV arranged the marriage between Margaret of Tirol and his son, Louis of Brandenburg, in 1342 after Margaret expelled her first husband, John Henry of Luxembourg.12

Louis IV declared Margaret’s previous marriage void on the grounds that it had not been consummated. By facilitating this union, he sought to secure control over the strategically important territory of Tirol for his own family, the House of Wittelsbach. This action was taken with significant haste and ultimately proved politically damaging, as it infuriated the papacy, caused a final rupture with the House of Luxembourg, and created an unfavorable impression throughout the empire.12