XV. Then the Cid went to besiege the Castle called Xerica, by advice of the King of Zaragoza, that he might have a frontier against Monviedro. This he did because, when the King came to relieve Valencia, Aboeza had covenanted to give up Monviedro unto him, the which he had not done; and the King thought that if he made war upon these Castles they must either yield unto him, or be at his mercy, because they did not belong to the King of Denia. But when Aboeza knew this he sent to Abenalfange the King of Denia, saying that he would give him the Castle; and the King of Denia incontinently came and took possession of it, and Aboeza became his vassal. When the Cid saw this he understood that Valencia must needs be lost, and thought in his heart that he could win the city for himself, and keep it. Then sent he letters to King Don Alfonso, in which he besought him of his mercy not to think it ill that the people who were with him should remain with him, for he would do God service, and maintain them at the cost of the Moors, and whensoever the King stood in need of their service, he and they would go unto him and serve him freely; and at other times they would make war upon the Moors, and break their power, so that the King might win the land. Well was King Don Alfonso pleased at this, and he sent to say that they who were in the Cid's company might remain with him, and that as many as would might go join him. And my Cid went to the King to commune with him, and while my Cid was with him, Don Ramon Berenguer, Lord of Barcelona, came to Zaragoza; and the King gave him great gifts, that he might not place his love upon any other for want; for the King had now put away his love from the Cid, thinking that because of him he had lost Valencia. And presently he sent a force to besiege Valencia under Don Ramon Berenguer; and he had two Bastilles built, one in Liria, which King Yahia had given him when he came to relieve him, and the other in Juballa, and he thought to build another on the side of Albuhera, so that none might enter into the city, neither go out from it. And he re-edified the Castle of Cebolla, that the Count might retire thither if it should be needful; and every day the Count attacked the city, and King Yahia defended himself, looking for the coming of the Cid to help him, according to the covenant which was between them.