The 16th-century French humanist writer Etienne de La Boetie has not often been considered in literature on republican political thought, despite his famous essay, Discours de la Servitude Volontaire, displaying a number of clear republican tropes and themes, being largely concerned with the problem of arbitrary power embodied in the figure of the tyrant. Yet, 1 argue that the real significance of La Boetie's text is in his radical concept of voluntary servitude and the way it adds a new dimension to the neo-republican theory of liberty as non-domination. The problem of self-domination or wilful obedience to authority is a form of ideological domination that Pettit's understanding of arbitrary power relationships between agents does not adequately account for. Furthermore, La Boetie shows that freedom is an ontological condition and is realised not - or not entirely - through the rule of law as the guarantee against arbitrariness, as neo-republicans advocate, but rather through acts of self-emancipation and civil disobedience. Here I understand La Boetie's thinking in terms of a certain anarcho-republicanism in which the promotion of freedom depends not so much on institutions, as Pettit suggests, but rather on autonomous relations of friendship, love and solidarity between individuals.