The Aeneid by Virgil Book 3 Page 29

Narycian Locri have built a city, and Lyctian Idomeneus has beset with soldiery the Sallentine plains; here is the famous town of Philoctetes, the Meliboean captain – tiny Petelia, strong within her wall. Moreover, when your ships have crossed the seas and anchored, and when you then raise altars and pay vows on the shore, veil your hair with the covering of a purple robe, that in the worship of the gods no hostile face may intrude amid the holy fires and mar the omens.

Hold to this mode of sacrifice, you and your company; let your children’s children in purity stand fast.

“‘But when, on departing thence, the wind has borne you to the Sicilian coast, and the barriers of narrow Pelorus open out, make for the land on the left and the seas on the left, long though