This book looks at family-based political power in three south Italian cities–Gaeta, Amalfi and Naples–and examines the ways in which medieval families can be reconstructed and their relationships with each other studied. It analyzes the changes that took place in these cities, particularly in the eleventh century, and their reactions to the Norman conquest of southern Italy in the latter part of the century. This is the first comparative study of the three cities and it is of special relevance to European studies of the early medieval family and state structures.