Atria (mod. Adria), a coastal city in the north of the Po delta (see padus), now nearly 20 km. (12½ mi.) from the sea. From the late 6th cent. bce onwards it was an important entrepôt for Greek and *Etruscan trade with the Po valley and Europe. Epigraphy suggests that the city was an originally Aeginetan foundation that came under Etruscan control in the 5th cent. (cf. Livy 5. 33. 8). Varro (De Ling 5.