This book presents the first interdisciplinary discussion by leading international historians of the important methodological tool known as prosopography - the collection of all known information about individuals within a given period. With the advent of computer technology it is now possible to gather and store such information in increasingly sophisticated and searchable databases, which can bring a new dimension to traditional historical research. The book surveys the transition in prosopographical research from more traditional methods to the new technology, and discusses the central role of the British Academy, as well as that of French, German and Austrian academic institutions, in developing prosopographical research on the Later Roman Empire, Byzantium and now Anglo-Saxon and other periods. The contributions discuss both national histories of the discipline and its potential for future research. The book demonstrates mutual benefits and complementarity in such studies between the use of new technology and the highest standards of traditional scholarship, and in doing so it sets forth new perspectives and methodologies for future work.