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Their acquiescence in this settlement would have been dictated by self-interest . The wealth of the relatively prosperous Muslim taifas furnished a strong enough lure to facilitate the raising of a volunteer army , given the increasing population and its pressures north of the Duero , motivated by the prospect of booty . But for a time in the late winter and early spring of 1080 Alfonso did lose the crucial support of the cardinal-legate . As against that difficult and highly dangerous enterprise , each partisan had merely to find the favor of the king in pursuit of one 's particular ambition . It is possible that he confirmed the document later or that it is simply a scribal error .