Hugh Cloke received his Ph.D. in literature from the University of Chicago and was, for forty years, a faculty member and administrator at Georgetown University in Washington, D.C. He retired in 2013 as an emeritus dean. His research and teaching interests focused on the role of Roman ruins in the works of 18th and 19-century American writers and visual artists and extended to coinage through the chance purchase of a small Constantinian bronze for his son in 1992. Over the intervening thirty years his interests in the coinage of the Tetrarchic period have evolved from collecting to researching their history and constructing a narrative that makes these objects intelligible. The present work is the result of a sixteen-year collaborative effort with Lee, which has branched out to collaborative cataloguing of several major hoards.