Selinunte was one of the most important of the Greek colonies in Sicily, situated on the southwest coast of that island, at the mouth of the small river of the same name, and 6.5 km west of that of the Hypsas (the modern Belice River). It was founded, according to historian Thucydides, by a colony from the Sicilian city of Megara, or Megara Hyblaea, under the conduct of a leader named Pammilus, about 100 years after the settlement of that city, with the addition of a fresh body of colonists from the parent city of Megara in Greece. The date of its foundation cannot be precisely fixed, as Thucydides indicates it only by reference to that of the Sicilian Megara, which is itself not accurately known, but it may be placed about 628 BCE. Diodorus places it 22 years earlier, or 650 BCE, and Hieronymus still further back, 654 BCE. The date from Thucydides, which is probably the most likely, is incompatible with this earlier epoch. The name is supposed to have been derived from quantities of wild parsley that grew on the spot. For the same reason, they adopted the parsley leaf as the symbol on their coins.
Selinunte was the most westerly of the Greek colonies in Sicily, and for this reason was early brought into contact and collision with the Carthaginians and the native Sicilians in the west and northwest of the island. The former people, however, do not at first seem to have offered any obstacle to their progress; but as early as 580 BCE we find the Selinuntines engaged in hostilities with the people of Segesta (a non-Hellenic city), whose territory bordered on their own. The arrival of a body of emigrants from Rhodes and Cnidus who subsequently founded Lipara, and who lent their assistance to the Segestans, for a time secured the victory to that people; but disputes and hostilities seem to have been of frequent occurrence between the two cities, and it is probable that in 454 BCE, when Diodorus speaks of the Segestans as being at war with the Lilybaeans (modern