On learning that his master has been slain, the Cid hastened to avenge him, and, as Sancho had left no heir, proclaimed Alfonso his successor. We are told that this young prince had already heard of his brother's death through a message from his sister, and, fearing the Moors would not allow him to depart for good, had merely asked permission to visit his kin. The wary Moorish king consented, but only on condition Alfonso would promise never to attack him or his sons, should he become king.
When Alfonso arrived at Zamorra, all the Spaniards readily did homage to him save the Cid, who refused to have anything to do with him until he had solemnly sworn he had no share in his brother's death. To satisfy the Cid, therefore, Alfonso and twelve of his men took a threefold oath in the church of Burgos; but it is said Alfonso never forgave the humiliation which the Cid thus inflicted upon him.
The new monarch proved to be a wise ruler for the kingdoms of Leon, Castile, Gallicia, and Portugal. He was not without his troubles, however, for shortly after his succession the Cid quarrelled with one of his nobles. Next the Moorish kings became disunited and Alfonso's former host summoned him to his aid. Not only did Alfonso assist this king of Toledo, but invited him into his camp, where he forced him to release him from the promise made on leaving his city. Not daring to refuse while in the power of the Christians, the Moorish king reluctantly consented, and was surprised and delighted to hear Alfonso immediately renew the oath, for, while not willing to be friends with the Moors under compulsion, he had no objection to enter into an alliance with them of his own free will.
Not long after this the king of Navarre sent forth his champion to challenge one of Alfonso's, the stake this time being three castles which the Cid won. But the Moors, taking advantage of the Cid's illness which followed this battle, rose up against Alfonso, who was compelled to wage war against them. In this campaign he would have fallen into the enemy's hands had not the Cid risen from his sick-bed to extricate him from peril! By this time the renown of the Cid was so great, that people in speaking of him invariably termed him "the Perfect One," thereby arousing such jealousy among the courtiers, that they persuaded Alfonso his subject was trying to outshine him! In anger the king decreed Rodrigo's immediate banishment, and, instead of allowing him the customary thirty days to prepare for departure, threatened to put him to death were he found within the land nine days later! As soon as the Cid informed his friends he was banished, one and all promised to follow wherever he went, as did his devoted cousin Alvar Fanez.
It is at this point that the present poem of the Cid begins, for the ballads covering the foregoing part of the Cid's life exist only in a fragmentary state. We are told that the decree of banishment proved a signal for the courtiers to plunder the hero's house, and that the Cid gazing sadly upon its ruins exclaimed, "My enemies have done this!" Then, seeing a poor woman stand by, he bade her secure her share, adding that for his part he would henceforth live by pillaging the Moors, but that the day would come when he would return home laden with honors.
On his way to Burgos the Cid was somewhat cheered by good omens, and was joined by so many knights in quest of adventure that no less than sixty banners fluttered behind him. A royal messenger had, however, preceded him to this city, to forbid the people to show him hospitality and to close his own house against him. The only person who dared inform the Cid of this fact was a little maid, who tremblingly reported that he was to be debarred from all assistance.
Pausing at the church only long enough to say a prayer, the Cid rode out of the gates of Burgos and camped on a neighboring hill, where his nephew Martin Antolinez brought him bread and wine, declaring he would henceforth share the Cid's fortunes in defiance of the king. It was to this relative that the Cid confided the fact that he was without funds and must raise enough money to defray present expenses. Putting their heads together, these two then decided to fill two huge chests with sand, and offer them to a couple of Jews in Burgos for six hundred marks, stating the chests contained treasures too heavy and valuable to be taken into exile, and assuring them that, if they solemnly pledged themselves not to open the chests for a year, they could then claim them, provided the Cid had not redeemed them in the meanwhile. Trusting to the Cid's word and hoping to enrich themselves by this transaction, the Jews gladly lent the six hundred marks and bore away the heavy chests.
Having thus secured the required supplies, the Cid proceeded to San Pedro de Cardena, where he entrusted his wife Ximena and two daughters to the care of the prior, leaving behind him funds enough to defray all their expenses. Then, although parting with his family was as hard as "when a finger-nail is torn from the flesh," the Cid rode away, crossing the frontier just as the nine days ended. He was there greatly cheered by a vision of the angel Gabriel, who assured him all would be well with him.
Entering the land of the Moors with a force of three hundred men, the Cid immediately proceeded to take a castle and to besiege the city of Alcocer. But this town resisted so bravely, that after fifteen weeks the Cid decided to effect by strategy the entrance denied by force. Feigning discouragement, he, therefore, left his camp, whereupon the inhabitants immediately poured out of the city to visit it, leaving the gates wide open behind them. The Cid, who was merely hiding near by, now cleverly cut off their retreat and thus entered Alcocer through wide-open gates.
No sooner did the Moors learn that the Cid had conquered this important place, than they hastened to besiege it, cutting off the water supply, to compel the Christians to come out. To prevent his men from perishing of thirst, the Cid made so vigorous a sortie that he not only drove the enemy away, but captured their baggage, thus winning so much booty that he was able to send thirty caparisoned steeds to Alfonso, as well as rich gifts in money to his wife. In return, the bearer of these welcome tokens was informed by King Alfonso that Rodrigo would shortly be pardoned and recalled.
Meanwhile the Cid, leaving Alcocer, had taken up his abode on the hill near Medina, which still bears his name. Thence he proceeded to the forest of Tebar, where he again fought so successfully against the Moors that he compelled the city of Saragossa to pay tribute to him. Rumors of these triumphs enticed hundreds of Castilian knights to join him, and with their aid he outwitted all the attempts the Moors made to regain their lost possessions. We are also told that in one of these battles the Cid took prisoner Don Ramon, who refused to eat until free. Seeing this, the Cid took his sword, Colada, and promised to set him and his kinsmen free if they would only eat enough to have strength to depart. Although doubtful whether this promise would be kept, Don Ramon and his follows partook of food and rode away, constantly turning their heads to make sure that they were not pursued.
As some of his subjects were sorely persecuted by the Moors, Alfonso now sent word to the Cid to punish them, a task the hero promised to perform, provided the king would pledge himself never again to banish a man without giving him thirty days' notice, and to make sundry other wise reforms in his laws. Having thus secured inestimable boons for his fellow-countrymen, the Cid proceeded to besiege sundry Moorish castles, all of which he took, winning thereby much booty. Having thus served his monarch, the Cid was recalled in triumph to Castile, where he was told to keep all he had won from the Moors. In return the Cid helped Alfonso to secure Toledo, seeing the king with whom this king had sworn alliance was now dead. It was while the siege of this city was taking place that Bishop Jerome was favored by a vision of St. Isidro, who predicted they would take the city, a promise verified in 1085, when the Cid's was the first Christian banner to float above its walls. Our hero now became governor of this town, but, although he continued to wage war against the Moors, his successes had made the courtiers so jealous that they induced the king to imprison Ximena and her daughters.