The flamboyant life of Kristina, the Queen of Sweden, one of Europe’s most mercurial monarchs, has long overshadowed her contribution to philosophy. When histories of philosophy mention her at all, they usually present her as the pupil of Descartes and as the patron of philosophical salons. But Kristina’s relationship to philosophy transcends her auxiliary roles. In her writings she makes her own distinctive contribution to moral and political philosophy. Her ethical texts explore the nature of virtue, defend gender equity, and posit criteria for religious truth. Her political works defend the civic tolerance of religious minorities. Like many a salonnière of the period, Kristina analyzes the nature and variations of love, but her theological and political interests provide her with a broader philosophical horizon than the predominantly romantic one of many French salons. Her philosophical work often explores the issue which bedeviled her political career: the nature and proper exercise of authority.