Ărĕnācum (Ărĕnātium, Tab. Peut.; Hărĕnātium, Itin. Anton.), i, n.,
a town in Gallia Belgica, now Aerth or Arth , near Herwen , Tac. H. 5, 20 sq.; cf. Ukert, Gall. p. 531.
ARENACUM is mentioned by Tacitus (Tac. Hist. 5.20) as the station of the tenth legion, when Civilis ...
Dictionary of Greek and Roman Geography