The legend tells that the first population estabilished in Vasto came from Dalmazia.  It was called "Histon" o by Diomede, a greek, remembering the Histone mountain, in Corfù. During the centuries the city grows, expecially under the Roman empire.

Campomarino is inhabitated from a long time, in 1980 was discovered a settlement of the 9th -15th century B.C., in a place now called Arcora. Destroyed many times during its history  (barbaric invasions over all), it's became an important center for Longobardic and Norman empires