Exploring republican ideas and concepts that developed in sixteenth-century Poland under the impact of humanism and the Renaissance, as well as political and constitutional changes, this is a landmark study of republican discourse in sixteenth-century Poland-Lithuania. It provides a conceptual and contextual analysis of the rich political literature and debate which animated intellectual life and political reasoning during the Polish-Lithuanian Commonwealth, and effectively demonstrates its republican character. Using a comparative perspective, Dorota Pietrzyk-Reeves situates the Polish republican discourse within both the classical and early modern republican traditions, bringing together contexts and ideas that have traditionally been overlooked by scholars of early modern Europe. In addition, she also underlines the originality of Polish concepts such as the relationship between law, liberty and virtue as key elements of a well-ordered commonwealth and the vision of a mixed res publica that had a monarchical character. This book is an invaluable resource for anyone interested in European intellectual history and the early modern republican tradition.