Tricesimum
Tricesimum, AD, in Gallia. D'Anville observes that the ancient Itins. contain many positions with similar names, which names of places are derived from the distances which they indicate from the principal towns; for the distances within the dependent territory were measured from the principal towns. This Tricesimum is measured from Narbo (Narbonne), as the Jerusalem Itin. shows, on the road to Toulouse, through Carcassonne. Trebes on the canal of Languedoc may represent the name; and Tricesimum may be near that place.
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.