While the victories of the Almohades in Africa were undermining the already crumbling empire of Ali, his Spanish dominions were overrun and wasted by Aragonese and Castilian armies. The supremacy of the clergy which followed the rise of the Almoravide dynasty was the signal for Christian persecution. In Andalusia, and especially throughout the principality of Granada, where the Mozarabes abounded, the Moslem theologians exercised with unrestricted severity the congenial privilege of oppression. Churches and monasteries were confiscated or destroyed under pretext of their construction since the Conquest, acts of encroachment which, although in contravention of the stipulations of Musa, had been tacitly ignored for centuries. Taxes far in excess of those prescribed by Mussulman law were imposed on the Christian tributaries. Under the most frivolous accusations their property was seized. Every indignity which popular envy or religious hatred could contrive was inflicted upon them. Their endurance exhausted, the Mozarabes of Granada, who, through the medium of Jewish merchants, had long held secret communication with their Castilian brethren, an intercourse which had suggested and promoted many a predatory expedition, now began to meditate permanent freedom from conditions scarcely less intolerable than those of servitude. The serious difficulties in which the Almoravide empire was involved; the contemptuous indifference of its ruler to the complaints of his subjects; the succession of Almohade victories; the withdrawal to Africa of the flower of the Andalusian troops for the defence of Morocco; the advance of the Castilian outposts, in the face of whose encroachments the frontier was continually receding; the reconquest of Saragossa, the last important Moslem bulwark in the North, all encouraged the hope that the Christian domination and the Christian faith might now be easily re-established from the Pyrenees to the Mediterranean. Excited by ill-timed dreams of liberty, the Mozarabes brought to bear every resource of solicitation and argument to tempt an invasion by the Christian princes. They despatched secret envoys to the court of Castile. They sent to Alfonso I., King of Aragon, topographical descriptions of the country, enumerations of its armies, information of the locations of its magazines and of the relative position and respective strength of its fortresses, its castles, and its arsenals. They promised their services as guides and pioneers. They pledged the support of the Christian tributaries of Granada, who, through the favor they had enjoyed under Hebrew ministers, exceeded in numbers and wealth those of any other province of the empire. To assurances of success, the Mozarabes enlarged upon the attractions which characterized the most fertile and beautiful valley in Andalusia. It was not strange that the cupidity of the Aragonese cavaliers should have been excited by such a picture, or their