 In his letter to Bishop Dobrogost, Pope Urban jointly mentioned the royal couple in March 1388, which implied that he had already acknowledged the legality of their marriage.However, Gniewosz of Dalewice, who had been William of Habsburg's supporter, spread rumours about secret meetings between William and Jadwiga in the royal castle.Jadwiga took a solemn oath before Jan Tęczyński, stating that she had only had marital relations with Władysław-Jogaila.