Pope Benedict XVI in his numerous writings evoked the concept of relativism and the reference to this term defined his pontificate. This research will provide valuable information regarding genesis of the Benedict's thought on relativism along three periods of his intellectual activity. This has been done by highlighting its origins: the ashes of Marxism and contemporary democracies. The primary purpose of this study is to manifest Benedict's own treatise of relativism in relation to two types of interlocutors: the decision-makers of the public sphere and Christian believers.