The Synecdemus or Synekdemos (Greek: Συνέκδημος) is a geographic text, attributed to Hierocles, which contains a table of administrative divisions of the Byzantine Empire and lists of their cities. The work is dated to the reign of Justinian but prior to 535, as it divides the 912 listed cities in the Empire among 64 Eparchies. The Synecdemus, along with the work of Stephanus of Byzantium were the principal sources of Constantine VII's work on the Themes (De Thematibus).