Theories, whose objectivity is still not established, but the interest of science, and one of its discussion topics have become, say that Posada in the first part of the Dana Shar ( "sea people") from Lydia (Asia Minor) stranded. These allegations are part of a theory that Sardinia of a people from the Middle East have been colonized and that believes that this is precisely the people of Shar Dana had, from the first Tyrrhener the Etruscans and finally emerged. Upon arrival on the island, they will spread out in Tuscany. To prove this hypothesis findings apply obsidian, whose trade to the Fourth millennium BC Sardinia immediately to a Mediterranean power erstarken left.

Posada actually finally evolved into a centre of the nuraghi Etruscans and, yes, perhaps even to the point of connection of these two cultures, probably for the first time in the transition from Feronia come into contact with each other.

The arrival of the Romans is uncertain, but it is assumed that they are not before 3 Century BC.

The Romans, the construction or rather the expansion of the Portus Liquidonis (or Portus Luguidonis) in San Giovanni in the small bay near the Tower of Aragon owe.

They also connects to the dissemination of the new name "Pausata", the then Spanish in the current form rose, with its variants "Possata", "Pasatta" (as in the current Sardinian), "Passata" (Vulgar Latin). This name means place of residence, travel stage, horses changing station, hub of barter transactions on land and water.

Well, place of the border, between land and sea, but also between "land" or "land".