Matrinus
Ματρῖνος
Matrinus (Ματρῖνος), a river of Picenum, flowing into the Adriatic, now called La Piomba. Strabo describes it as flowing from the city of Adria, but it is in reality intermediate between Adria (Atri) and Angulus (Civita S. Angelo). According to the same writer it had a town of the same name at its mouth, which served as the port of Adria. (Strab. v. p.241.) Ptolemy also mentions mouth of the river Matrinus next to that of the Aternus, from which it is distant about 6 miles (Ptol. 3.1.20), but he is certainly in error in assigning it to the Marrucini.
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.