Christine de Pizan (1364-1431) has been recognised as a poet, early humanist and feminist precursor but rarely as political theorist whose works were intended to have a direct impact on the tumultuous politics of her time. The essays in this collection focus on Christine as a political writer and provide an important resource for those wishing to understand her political thought. They locate her political writing in the late medieval tradition, discussing her indebtedness to Aristotle, Aquinas and Augustine as well as her transformations of their thought. They also illuminate Christines political epistemology her understanding of political wisdom as a part of theology, the knowledge of God. New light is thrown on the circumstances which prompted Christine to write on political issues and on her attitude to Isabeau of Bavaria. These essays show that Christines originality consisted in her capacity to modify and feminise the tradition of Christian Aristotelianism through the use of elements of Christian imagery, in particular Mariology, in order to construct an image of the virtuous and prudent monarch which had lost the explicitly manly and warlike character of the Aristotelian phronimos. This reconfigured image of the monarch lent itself to the extension which she developed in her more feminist works, which demonstrated the prudence of women and their capacity, in times of need, to function as authoritative political figures.