In 272 the most important town in this region seems to be Segesta. Later known as Tigulliorum. Modern site name is Sestri Levante. Use the Barrington Classical Atlas or the Tabula Imperii Romani L 32, Mediolanum-Aventicum-Brigantium, published in 1966 in Rome.
I wasn't involved in picking this site, just relating some of the reference info here.
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