It is interesting to remark how this list represents the Greek colonies, from Libya to Sicily, from the Euxine to the Adriatic. Greece proper, on the other hand, is represented only by Megara and Sicyon.
Marcellus, after an unsuccessful attempt to negotiate, began the siege in regular form (214 B.C.) by both land and sea, establishing a camp on Polichne, where stood the old temple of Olympian Zeus; but he made his chief assault on the northern side and on the defences of Tyche, particularly at the Hexapylum, the entrance facing Megara and Leontini.
The conquest of Corinth and Megara was placed a generation later: Arcadia alone claimed to have escaped invasion.
The power of the nobles would seem to have been more effectively broken in a war with Athens, in which Megara ultimately lost the island of Salamis (about 570, see SoLoN), for shortly afterwards the constitution was changed to a democracy, and eventually was fixed as an oligarchy of a moderate type.
Two other passes, farther to the west, were crossed by the roads from Plataea to Athens and to Megara respectively.
Earlier writers make this the site of Labdalum, and put Euryelus farther west; but Labdalum must be sought somewhat farther east, near the northern edge of the plateau, in a point not visible from the Athenian central fort (KUKXos) with a view over Megara - not therefore in the commanding position of Dionysius's fort, with an uninterrupted view on all sides.
Pais, Atakta (Pisa, 1891), 55, who attributes its foundation, under the name of Tauromenion (which it soon lost), to the Zancleans of Hybla (afterwards Megara Hyblaea).
On the whole, the history of its effect in Athens, Argos, Miletus, Megara and Syracuse (where it was called Petalismus), furnishes no sufficient defence against its admitted disadvantages.
Favoured by its proximity to two great waterways and by its two ports, Nisaea on the Saronic and Pegae on the Corinthian Gulf, Megara took a prominent part in the commercial expansion of Greece from the 8th century onwards, and for two hundred years enjoyed prosperity out of proportion to the slight resources of its narrow territory.
Cauer, Parteien and Politiker in Megara and Athen (Stuttgart, 1890), pp. 1-44; B.