TREIA( Eth. Treiensis: Ru. near Treja), a municipal town of Picenum, situated on the left bank of the river Potentia, about 9 miles below Septempeda ( S. Severino) and 5 above Ricina. Pliny is the only geographer that mentions it; but it is probable that the Τραΐαναof Ptolemy is only a corruption of its name. (Plin. Nat. 3.13. s. 18; Ptol. 3.1.52.) The Treienses are enumerated by Pliny among the municipal communities of Picenum, and the municipal rank of the town is further attested by several inscriptions. (Orell. Inscr. 516, 3899.) It seems indeed to have been a considerable place. The Itinerary of Antoninus places it on the branch of the Via Flaminia which led direct to Ancona: it was 9 miles from Septempeda and 18 from Auximum. ( Itin. Ant. p. 312.) Cluverius says that he could find no trace either of the place or the name; but the ruins were pointed out by Holstenius as still existing on the left bank of the Potenza, at the foot of the hill occupied by the village of Montecchio. The latter place has since adopted the ancient name of Treja, and having been augmented by the population of several neighbouring villages, is now become a considerable town. (Cluver. Ital. p. 738; Holsten. Not. ad Cluv. p. 136.)
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