The humanist perception of fourteenth-century Rome as a slumbering ruin awaiting the Renaissance and the return of papal power has cast a long shadow on the historiography of the city. Challenging the view, this book argues that Roman political culture underwent dramatic changes in the late Middle Ages, with profound and lasting implications for the city's subsequent development. The book examines the transformation of Rome's governing elites as a result of changes in the city's economic, political, and spiritual landscape. It explores this shift through the history of Roman political society, its identity as an urban commune, and its once-and-future role as the spiritual capital of Latin Christendom. Tracing the contours of everyday Roman politics, the book reframes the reestablishment of papal sovereignty in Rome as the product of synergy between papal ambitions and local political culture. More broadly, it emphasizes Rome's distinct role in evolution of medieval Italy's city-communes.