Being soon recalled to the presence of Alphonso, in consequence of the king's needing his military aid, the Cid left the scenes of his martial triumphs, and, without demanding reparation for the injuries he had sustained, returned to defend his persecutors; ever ready, while in disgrace, to forget everything in the performance of his duty to his king, and equally ready, when enjoying {91} the favour of the sovereign, to displease him, if it should be necessary to do so, by advocating the cause of truth and justice.[2] While the prowess of the Cid maintained the contest, the Christians had the advantage; but a few years after his death, which occurred in the year 1099 and the 492d of the Hegira, the Moors of Andalusia changed masters, and became, for a time, more formidable than ever to their Spanish foes. After the fall of Toledo, Seville had increased in power. The sovereigns of that city were also masters of ancient Cordova, and possessed, in addition, Estremadura and a part of Portugal. Benabad, king of Seville, one of the most estimable princes of his age, was now the only one of its enemies capable of disturbing the safety of Castile. Alphonso IV., desirous of allying himself with this powerful Moor, demanded his daughter in marriage. His proposal was acceded to, and the Castilian monarch received several towns as the dowry of the Moorish princess; but this extraordinary union, which seemed to ensure peace between the two nations, nevertheless soon became either the cause or the pretext of renewed contests. {92} Africa, after having been separated from the vast empire of the Caliphs of the East by the Fatimite caliphs, and being, during three centuries of civil war, the prey of a succession of conquerors more ferocious and sanguinary than the lions of their deserts,[3] was now subjected to the family of the _Almoravides_, a powerful tribe of Egyptian origin. Joseph-ben-Tessefin, the second prince of this dynasty, founded the kingdom and city of Morocco. Endowed with some warlike talents, proud of his power, and burning to augment it, Joseph regarded with a covetous eye the beautiful European provinces which had formerly been conquered by the Mussulmans of Africa. Some historians assert that the King of Castile, Alphonso IV., and his father-in-law Benabad, king of Seville, having formed the project of dividing Spain between them, committed the capital error of summoning the Moors of Africa to their assistance in this grand design. But others, founding their assertions upon more plausible reasoning, say that the petty Mussulman kings, who were the neighbours or tributaries of Benabad, justly alarmed at his alliance with a {93} Christian king, solicited the support of the Almoravide.