Rodrigo gave a wily counsel to the routed Castilians. "The Leonese are not expecting an attack," he said; "let us return and fall upon them at unawares." The counsel was followed; the victors, resting in their tents, were surprised at daybreak, and only a few, Alfonso among the number, escaped with their lives. Alfonso was imprisoned at Burgos, but soon released at the entreaty of the Princess Urraca, on condition of his becoming a monk. Availing himself of such liberty, he escaped from the monastery to the Moorish court of Mamoun, King of Toledo. Sancho ruled thus over the entire heritage of his father,--Zamora excepted, the portion of Urraca. While laying siege to that city, he was slain by a cavalier in Urraca's service, Bellido Dolfos, who, sallying from the city, made good his escape, though almost overtaken by the avenging Campeador, 1072. Alfonso, the fugitive at Toledo, was now rightful heir to the throne; and however reluctant the Castilian nobles were to recognize the authority of a Leonese king, they yielded to necessity. It is asserted--but the historical evidence here is not complete--that before recognizing Alfonso's authority the Castilian nobles required of him an oath that he had no part in his brother's murder, and that it was the Campeador who administered this oath, 1073. Whatever the facts, Alfonso will have thought it wise to conciliate the good-will of the Castilian grandees, and especially that of their leader Rodrigo, until at least his own position became secure. To this we may attribute his giving to Rodrigo in marriage of Jimena, daughter of Diego, Count of Oviedo, and first cousin of the King. The marriage contract, bearing date 1074, is preserved at Burgos. Some years later Rodrigo was sent to collect the tribute due Alfonso by his vassal Motamid, King of Seville. Finding the King of Granada at war with Motamid, Rodrigo requested him not to attack an ally of Alfonso. But prayers and threats were alike unavailing; it came to battle, and Rodrigo conquered. Among the prisoners were several Christians in the service of Granada, notably Garcia Ordonez, a scion of the royal Leonese house. Not long after, we find Rodrigo charged with having appropriated to his own use a portion of the tribute and gifts sent to Alfonso by Motamid, Garcia Ordonez being his chief accuser. Taking advantage of the pretext--it can have been but a pretext--of Rodrigo's attacking the Moors without first securing the royal consent, Alfonso banished him. Old wrongs still rankling in the King's memory furnished probably the real motive.