IV's second attempt to reign over Lorraine in 940 was based on his asserted claim to be the rightful Duke of Lorraine due to his marriage to Gerberga of Saxony, Otto's sister and the widow of Gilbert, Duke of Lorraine. Otto did not recognize Louis IV's claim and appointed his brother Henry as duke instead. In the following years, both sides tried to increase their influence in Lorraine, but the duchy remained a part of Otto's kingdom. Despite their rivalry, Louis IV and Hugh were both tied to Otto's family through marriage bonds. Otto intervened for peace in 942 and announced a formal reconciliation between the two. As a part of the deal, Hugh was to perform an act of submission to Louis IV, and in return, Louis IV was to waive any claims to Lorraine. After a short period of peace, the West Frankish kingdom fell into another crisis in 946. Normans captured Louis IV and handed him over to Hugh, who released the King only on condition of the surrender of the fortress of Laon. At the urging of his sister Gerberga, Otto invaded France on behalf of Louis IV, but his armies were not strong enough to take the key cities of Laon, Reims, and Paris. After three months, Otto finally lifted the siege without defeating Hugh, but managed to depose Hugh of Vermandois from his position as Archbishop of Reims, restoring Artald of Reims to his former office. To settle the issue of control over the Archdiocese of Reims, Otto called for a synod at Ingelheim on 7 June 948. The assembly was attended by more than 30 bishops, including all the archbishops of Germany - a demonstration of Otto's strong position in East and West Francia alike. The synod confirmed Otto's appointment of Artald as Archbishop of Reims, and Hugh was admonished to respect his king's royal authority. But it was not until 950 that the powerful vassal accepted Louis IV as king; the opponents were not fully reconciled until March 953. Otto gave the control of West Frankish affairs to his son-in-law Conrad the Red and later Bruno the Great, together with Otto's sisters Gerberga and Hadwig who were regents for their sons King Lothar and Duke Hugh. Early Ottonian rulers received feudal commendations and decided on royal and episcopal succession disputes in the western kingdom. Bruno intervened militarily in West Francia in 958,