Pausanias Description of Greece 1.39.4

[4] Next to Eleusis is the district called Megaris . This too belonged to Athens in ancient times, Pylas the king having left it to Pandion. My evidence is this; in the land is the grave of Pandion, and Nisus, while giving up the rule over the Athenians to Aegeus, the eldest of all the family, was himself made king of Megara and of the territory as far as Corinth . Even at the present day the port of the Megarians is called Nisaea after him. Subsequently in the reign of Codrus the Peloponnesians made an expedition against Athens . Having accomplished nothing brilliant, on their way home they took Megara from the Athenians, and gave it as a dwelling-place to such of the Corinthians and of their other allies as wished to go there.

[4] Next to Eleusis is the district called Megaris. This too belonged to Athens in ancient times, Pylas the king having left it to Pandion. My evidence is this; in the land is the tomb of Pandion, and Nisos, while giving up the rule over the Athenians to Aigeus, the eldest of all the family, was himself made king of Megara and of the territory as far as Corinth. Even at the present day the port of the Megarians is called Nisaia after him. Subsequently in the reign of Kodros the Peloponnesians made an expedition against Athens. Having accomplished nothing brilliant, on their way home they took Megara from the Athenians, and gave it as a dwelling-place to such of the Corinthians and of their other allies as wished to go there.