‘We have been sent to summon you, King Alfonso,’ said the messengers when they found him, falling on their knees as they spoke. ‘Don Sancho was foully stabbed by Bellido el Dolfos, and the men of Castile and Leon call on you to take his place. Don Rodrigo only hangs back, and swears he will never take the oath of fealty till you have proved that you had no part in the murder of your brother.’
Don Alfonso felt glad at their words. He had received nothing but ill at the hands of his brother, and he hurried to place himself at the head of the army of Castile. But the Arab ruler was not willing to let him go, and many days passed before he was able to escape at night, climbing silently with a few followers down the walls of Toledo; then, turning the shoes on the feet of their horses, so that the track should point south instead of north, they made the best of their way to Zamora.
The nobles received the king with joy, and, kneeling to kiss his hand, vowed to be true to him. The Cid alone held aloof.
‘You are heir to the throne, Don Alfonso,’ said he, ‘but before I bend the knee to you I demand that you and twelve of your vassals shall swear that you are innocent, in deed or in word, of the blood of your brother.’
‘I will swear it,’ answered Alfonso, ‘when and where you please, and twelve men of Leon shall swear it likewise.’
‘You shall swear to me in the holy cathedral of Santa Gadea in Burgos,’ said the Cid; and thither they all rode silently and solemnly, while Don Rodrigo, standing at the altar, held out the crucifix to the kneeling king. But though the oath was taken freely, both by Alfonso and his vassals, deep in the heart of the Cid lay a doubt of his truth.
‘You shall swear it thrice,’ he said, and Alfonso, devoured as he was with rage, knew the Cid’s power too well to disobey, though his face grew pale with wrath.
‘You shall answer for this,’ he cried as he rose to his feet, and from that day the king never ceased to seek for an excuse to compass Don Rodrigo’s banishment. At last he found one.
The Moorish king of Toledo laid a complaint against the Cid that, in spite of his alliance with Alfonso of Castile, his lands had been ravaged and his people made captive. Well Alfonso knew that it was the Moors themselves who had broken faith with him, and had wasted the Spanish territories which lay along their borders, but he eagerly snatched at the plea, and bade the Cid go, an exile, from Castile, while his possessions were declared forfeit.
With every insult heaped on him that the king could invent, the Cid left the city and rode to his castle of Bivar, only to find that his enemies had been before him and had stripped it bare, while his wife and children had sought refuge in the convent of San Pedro de Cardeña.