His rival was Louis IV of Bavaria. With her marriage, Isabel became one of two Queens of Germany with Beatrix von Silesia-Glogau, wife of Louis IV. On 5 September 1325, Frederick I and Louis IV resolved their conflict by agreeing to serve as co-rulers.
Louis IV of Bavaria was his adversary. Through her union, Isabel became one of two Queens of Germany alongside Beatrix von Silesia-Glogau, wife of Louis IV. On September 5, 1325, Frederick I and Louis IV resolved their dispute by sharing the rulership.