Origiacum
Ὀριγιακόν
Origiacum (Ὀριγιακόν). Ptolemy (2.9.7) makes this town the chief place of the Atribatii or Atrebates in Belgica. There is nothing that fixes the position of Origiacum except its resemblance to the name Orchies, which Cluver suggested. Orchies is between Douay and Tournay, and appears to be beyond the limits of the Atrebates, whose chief town in Caesar's time was Nemetacum (Arras).
From William Smith (ed.), Dictionary of Greek and Roman Geography. Text provided under a CC BY-SA license by Perseus Digital Library, http://www.perseus.tufts.edu, with funding from the National Endowment for the Humanities and Tufts University. Data accessed from https://github.com/PerseusDL/canonical-pdlrefwk/ on 17 October 2026.