This book examines the relationship between the idea of legitimacy of law in a democratic system and equality, conceived in a tripartite sense: political, legal, and social. Exploring the constituent elements of the legal philosophy underlying concepts of legitimacy, this book seeks to demonstrate how a conception of democratic legitimacy is necessary for understanding and reconciling equality and political legitimacy by tracing and examining the conceptions of equality in political, legal, and social dimensions. In the sphere of political equality this book argues that the best construction of equality in a democratic system - which resonates with the legitimizing function of majority rule - is that of equality of political opportunity. It is largely procedural, but those procedures represent important substantive values built into a majoritarian system.