To this end, he amassed within his tower a vast library of arcane knowledge. Of chief interest to Saruman was the mastery of ringcraft; for it was with the creation of the Rings of Power that the Dark Lord nearly conquered all of Middle-earth once before, and might yet again should he reclaim the missing One.
Over the years he sought clues to the Ring is whereabouts, hoping to be the first to find it and perhaps wield its power for himself. For even as he conferred and planned with his allies to stand against Sauron, in secret Saruman had become enamoured with the ways of his adversary, a fate hastened by his use of the Palantír of Orthanc. At first the Wizard had used the seeing stone to spy upon Mordor, but in time he came to commune directly with the Dark Lord. Content as he might, Saruman was no match for his enemy. Pride blinded him to his weakness, and Sauron, through lies and sheer force of will, made the White Wizard his vassal; an instrument to be wielded and ultimately discarded in his design to subjugate all free peoples of the world.