Rebellious under this harsh decree because of its manifest injustice, Alfonso and Berenguela endeavored to hold out against the pontiff, and for seven years they lived together as man and wife, making their home in Leon. Their life was to some degree a happy one together, children were born to them, but ever about their path was the shadow of doubt that was cast by the pope's decree. As a sad and pitiful end to it all, Berenguela, a mother though not a wife, was forced to return to her father's court in Castile, leaving the eldest son, Fernando, with the father. In but one thing had the pope shown any mercy for this wedded pair, and that was when he had consented to recognize the legitimacy of their children; so Fernando could now be considered, without any doubt, as the rightful heir to Leon. Meanwhile, Alfonso III. of Castile, Berenguela's father, had won new laurels at the great battle known as the Navas de Tolosa, where the Moors had suffered a crushing defeat, and Castile was more than ever the leading Spanish power. But soon after Berenguela's arrival, her father went to his long rest, and the crown descended to his oldest son, Enrico, who was but a boy of ten. Queen Eleanor was first intrusted with the administration of affairs, but she soon followed her husband, dying within a month after this power had been conferred upon her, and the regency passed by common consent to the prudent care of Berenguela, who was, according to Hume, "the fittest ruler in all Spain, the most prudent princess in all Christendom." This regency, however, was not a time of peace and quiet, for the death of the old king had given opportunity for the turbulent Lords of Lara to break forth again in open revolt, and after a year of ineffectual resistance Berenguela was compelled, in the interests of domestic harmony, to surrender the person of her young brother into the control of Alvaro Nunez, the leader of the opposition, who at once began to rule the kingdom with a heavy hand. What Berenguela's fate would have been and what Castile's if this usurper had been allowed to remain for a long time in power is a matter for conjecture, but Alvaro's dreams of success were soon shattered. Through some whim of fate it happened that the young king was accidentally killed one morning as he was at play in the courtyard of the palace, and Berenguela, as the only lawful heir, became the Queen of Castile in her own right. In this trying moment, clear-headed as usual, she gave further proof of her astuteness. She realized that her husband might in some way try to make political capital out of the situation and might try to work in his own interests rather than in those of their son. For the young Fernando, recognized as heir to Leon, would now, as the prospective ruler of Castile, be heir to a larger estate than that of his father, and Alfonso was not a man big enough to rejoice in this fact, as Berenguela well knew.