In the meanwhile Pedro wavered in his fidelity to his mistress long enough to be infatuated with Doña Juana de Castro. Not being able to win her to his desires, he proposed marriage; and the bishops of Avila and Salamanca stooped first to substantiate his pretence that he had not really married Blanche of Bourbon and then to marry him to Juana de Castro. When he had tired of her person, the king told her that his marriage with Blanche was a true marriage, and the other only a ruse to overcome her scruples. A son was born of this outrageous deception.[a] When news of this base transaction reached the brother of Juana, Ferdinand Perez de Castro, who was one of the most powerful lords of Galicia, he instantly joined the league of the discontented. A civil war now commenced, which, during some months, raged with more animosity than success to either party. On its commencement, the king, persuaded that the fortress of Arevalo was not a secure prison for the unfortunate Blanche, ordered her, as we have seen, to be conveyed to Toledo and lodged in the Alcazar of that city. She was immediately rescued from the power of her jailer, who returned to acquaint his employer with the event. Furious at the intelligence, Pedro ordered the commanders of Santiago, first to depose their grand-master, his brother Fadrique, then to march on Toledo, and force the princess from her sanctuary. But she was no longer there; the whole city had taken her part, and honourably placed her, under a strong guard, in the palace of their kings. These defenders of oppressed innocence were now joined by the heads of the league, whose party daily acquired strength. [Sidenote: [1354-1355 A.D.]] Neither the sudden, perhaps suspicious, death of Albuquerque, nor the deposition of Don Fadrique, depressed their zeal. To show that a redress of grievances, and not individual ambition, was their object, they despatched messengers to the king, with the assurance of their attachment to his person, and proposed that, if he would dismiss his mistress with her kinsmen, and return to his queen, they would instantly lay down their arms. Pedro was resolved to do neither; but, as it suited his views to protract the negotiation, he nominated commissioners to treat with those of the league, which was now strengthened by the accession of the queen-mother. To bring about an amicable adjustment between her son and his barons, she invited both to Toro, where she then abode--an invitation which both accepted. But Pedro now found that he was the prisoner of the leaguers, who changed the officers of his household, substituted others from their own body, and closely watched his motions at the time they were treating him with the highest outward respect. To escape from his situation, he had recourse to his usual arts--to bribing some heads of the league, and, above all, to dissimulation, in both cases with success. The king soon contrived to escape, and threw himself into the fortress of Segovia.