According to legend, Alfonso VI was forced by El Cid to take an oath denying that he had been involved in his brother's death, thus giving rise to mutual distrust between the two men, despite Alfonso VI's efforts at rapprochement by offering his kinswoman Jimena Díaz to El Cid in marriage as well as the immunity of his patrimony. These events and their consequences would eventually come to be considered historical by many later chroniclers and historians; however, most modern historians deny that such an event ever took place.