Ferdinand “the Great” was succeeded in his three kingdoms of Castile, Leon, and Gallicia, by his three sons, Sancho, Alfonso, and Garcia, the last of whom received the two counties of Coimbra and Oporto as fiefs of Gallicia, and maintained Nuno Mendes and Sesnando as his feudatories. Under them were many feudal barons, who held their lands on condition of military service. It is fortunately not necessary to enter into the history of the wars between the sons of Ferdinand; it is enough to say that the second of them, Alfonso of Leon, eventually united all his father’s kingdoms in 1073, as Alfonso VI. The successes of the Christians aroused the stubborn resistance of the Moors; a fresh wave of fanaticism passed over the Mohammedans of Africa and of the peninsula, and a new dynasty, that of the Almoravides arose, which subdued the various emīrs and wālis who had usurped the government of various portions of the old Ommeyad caliphate, and once more united the Moorish power. The new dynasty collected great Moslem armies, and in 1086 Yūsuf Ibn Teshfīn routed Alfonso utterly at the battle of Zalaca, and reconquered the peninsula up to the Ebro. In this battle all the chivalry of the Moors and Christians was engaged, and among the latter was Sesnando, Count of Coimbra, followed by his knights. Alfonso tried to compensate for this defeat and his loss of territory in the east of his dominions by conquests in the west, and in 1093 he advanced to the Tagus and took Santarem and Lisbon, and made Sueiro Mendes count of the new district. But these conquests he did not hold for long; the Almoravides were in the full flush of success, and their armies were made almost irresistible by the fresh fanaticism inspired into them. Their conquests in the east of the peninsula after the battle of Zalaca were followed by rapid successes in the west. In 1093 Seyr, the general of the Almoravide caliph Yūsuf, took Evora from the Emīr of Badajoz; in 1094 he took Badajoz itself, and killed the emīr; and retaking Lisbon and Santarem forced his way up to the Mondego. To resist this revival of the Mohammedan power, Alfonso summoned the chivalry of Christendom to his aid. Among the knights who joined his army eager to win their spurs, and win dominions for themselves were Count Raymond of Toulouse and Count Henry of Burgundy. To the former, Alfonso gave his legitimate daughter Urraca and Gallicia; to the latter, his illegitimate daughter Theresa, and the counties of Oporto and Coimbra, with the title of Count of Portugal.