make friends unto himself among Christians and among Moors, and fail me in all which he covenants. Nevertheless I will do this thing which your King requires of me; but if in the end he lie, I will come back upon him and destroy him, trusting in God that he cannot defend himself against me. And when the interpreters heard this they were greatly dismayed, and they returned and told their King all that he had said. And the Moors seeing that they could not help themselves, made such terms with him as it pleased him to grant, and gave him hostages that they might not be able to prove false. And they gave him gold and silver and precious stones in abundance, so that with great riches and full honourably did he and all his men depart from the siege. III. Greatly was the King of Aragon displeased at this which King Don Sancho had done, thinking that it was to his great injury and abasement, for Zaragoza he held to be within his conquest. And he came out with all his power to cut off the King's return, and took possession of the way, and said unto him that he should not pass till he had made amends for the great dishonour which he had wrought him, in coming into his conquest and against his vassals: the amends which he required was, that he should yield unto him all the spoil, and all which the King of Zaragoza had given him, else should he not pass without battle. When King Don Sancho heard this, being a man of great heart, he made answer, that he was the head of the kingdoms of Castille and Leon, and all the conquests in Spain were his, for the Kings of Aragon had no conquests appertaining unto them, being by right his tributaries, and bound to appear at his Cortes. Wherefore he counselled him to waive this demand, and let him pass in peace. But the King of Aragon drew up his host for battle, and the onset was made, and heavy blows were dealt on both sides, and many horses were left without a master. And while the battle was yet upon the chance, King Don Sancho riding light bravely through the battle, began to call out Castille! Castille! and charged the main body so fiercely that by fine force he broke them; and when they were thus broken, the Castillians began cruelly to slay them, so that King Don Sancho had pity thereof, and called out unto his people not to kill them, for they were Christians. Then King Don Ramiro being discomfited, retired to a mountain, and King Don Sancho beset the mountain round about, and made a covenant with him that he should depart, and that the King of Zaragoza should remain tributary to Castille; and but for this covenant the King of Aragon would then have been slain, or made prisoner. This was the battle whereof the Black Book of Santiago speaketh, saying, that in this year, on the day of the Conversion of St. Paul, was the great slaughter of the Christians in Porca. In all these wars did my Cid demean himself after his wonted manner; and because of the great feats which he