The fourth in a series of five catalogues, this volume's sections have a more extensive treatment, featuring imperial costume and regalia, their importance in coin designs; the coordination, control, and methods of coin production; and an excursus on the main issues of the years around 1204. The introductions to each reign have also been expanded to take account of the historical and numismatic complexities of the period, and many more specimens from outside Dumbarton Oaks have been illustrated, offering a greater degree of coverage. This volume is in two parts. Part I covers the reigns of Alexius I to Alexius V (1081-1204), and Part II covers the emperors of Nicea and their contemporaries (1204-1261).