Description: A map of the Roman Empire divided into four prefectures: the Prefecture of Gaul, the Prefecture of Italy, the Prefecture of Illyricum, and the Prefecture of the East. The Roman Empire was divided into these prefectures during the reign of Diocletian. Source: P. V. N. Myers, A General History for Colleges and High Schools (Boston, MA: Ginn & Company, 1896) 332 Map Credit: Courtesy the private collection of Roy Winkelman.
