The work On the Reigns attributed to Genesios is an important and pivotal source for the history of the latter part of the ninth century and of the later stages of the iconoclast controversy. This is the first English translation.The translation is accompanied by a detailed commentary including references to current scholarly work in this area. Like the recently published translation of Theophanes, it will add to the increasing network of sources for Middle Byzantine history available in annotated English translation.Anthony Kaldellis, of the University of Michigan, has held a Bliss Fellowship at the Dumbarton Oaks Center for Byzantine Studies, where much of the work leading to the publication of this book was carried out.