TRI´NIUS
TRI´NIUS (
Trigno), a considerable river of Samnium, which has its sources in the rugged mountain district between
Agnone and
Castel di Sangro, and has a course of about 60 miles from thence to the Adriatic. During the lower part of its course it traverses the territory of the Frentani, and falls into the sea about 5 miles SE. of Histonium (
Il Vasto). The only ancient writer who mentions it is Pliny (
3.12. s. 17), who calls it “flumen portuosum:” it is, indeed, the only river along this line of coast the mouth of which affords shelter even for small vessels.
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E.H.B]