 Cain, was at this time, a member of Ra's al Ghul's League of Assassins.Ra's had created the League to be "The fang that protects his head", but he had grown tired of the uncertain loyalties of its members.When he learned of the theories Cain was developing to train a perfect killer, Ra's was intrigued, and supplied Cain with infant test subjects in the hopes of creating a new generation of assassins.