The conquest of Toledo was far from satisfying the ambition of Alfonso: he rapidly seized on the fortresses of Madrid, Maqueda, Guadalaxara, and established his dominion on both banks of the Tagus. Mahomet now began seriously to repent his treaty with the Christian, and to tremble even for his own possessions. He vainly endeavored to divert his ally from the projects of aggrandizement which that ally had evidently formed. The kings of Badajoz and Saragossa became tributaries to the latter; nay, if any reliance is to be placed on either Christian or Arabic historians,[29] the King of Seville himself was subjected to the same humiliation. However this may have been, Mahomet saw that unless he leagued himself with those whose subjugation had hitherto been his constant object--the princes of his faith--his and their destruction was inevitable. The magnitude of the danger compelled him to solicit their alliance. [Footnote 29: Condé gives the translation of two letters--one from Alfonso to Mahomet, distinguished for a tone of superiority and even of arrogance, which could arise only from the confidence felt by the writer in his own strength; the other from Mahomet to Alfonso, containing a defiance. The latter begins: "To the proud enemy of Allah, Alfonso ben Sancho, who calls himself lord of both nations and both laws. May God confound his arrogance, and prosper those who walk in the right way!" One passage of the same letter says: "Fatigued with war, we were willing to offer thee an annual tribute; but this does not satisfy thee: thou wishest us to deliver into thine hands our towns and fortresses; but are we thy subjects, that thou makest such demands, or hast thou ever subdued us? Thine injustice has roused us from our lethargy," etc.] As the King of Saragossa was too much in fear of the Christians to enter into any league against them, and as the one of Valencia (Yahia) reigned only at the pleasure of Alfonso, the sovereigns of Badajoz, Almeria, and Granada were the only powers on whose coöperation he could calculate (he had annihilated the authority of several petty kings). He invited those princes to send their representatives to Seville, to consult as to the measures necessary to protect their threatened independence. The invitation was readily accepted. On the day appointed, Mahomet, with his son Al Raxid and a considerable number of his _wazirs_ and _cadis_, was present at the deliberations. The danger was so imminent--the force of the Christians was so augmented, and that of the Moslems so weakened-- that such resistance as Mahometan Spain alone could offer seemed hopeless. With this conviction in their hearts, two of the most influential cadis proposed an appeal to the celebrated African conqueror, Yussef ben Taxfin, whose arm alone seemed able to preserve the faith of Islam in the Peninsula.