Abstract
The discussion of political normativity is a core controversial issue in Bernard Williams’s realist theory of legitimacy. This article attempts to demonstrate that the political normativity in his theory of legitimacy should be comprehended based on his theory of liberty, where Williams’s notion of the cost in liberty is vital to this picture. It has this status in virtue of the realist characteristics of his theory of legitimacy, of the significance of coercive issues behind this realist theory of legitimacy. Interpreting Williams’s theory of legitimacy from the perspective of the notion of the cost in liberty satisfies an inherent requirement for a realist theory of legitimacy that it should be closely associated with the attitudes of its subjects. For Williams, the normative value of legitimacy ultimately embodied in its realisation of compatible protection for the freedoms of individuals. This protection process is carried out through the political. Moreover, this process reflects a historical self-consciousness, thereby meeting Williams’s insistence that a realistic political theory should have a historical dimension.