Professor Noonan here sets out to examine what Islamic silver coins (dirhams) reveal about the great trade between the Islamic world, European Russia, and the Baltic during the early Viking Age. Particular attention is devoted to the origins of this international commerce and the role of such peoples as the Vikings and Khazars. As he shows, the study of these coins also throws new light on mint output in the a Abbasid caliphate, the historical significance of specific dirham hoards, and how the patterns of trade evolved during the course of the ninth century."