History of the Peloponnesian War

The Megareans also came over into alliance with the Athenians, having revolted from the Lacedaemonians, because the Corinthians were pressing them with war about the boundaries of their territory. And the Athenians received possession of Megara and Pegae, and built for the Messenians the long walls from the city to Nisaea, and themselves manned them. And it was chiefly from this that their excessive hatred of the Athenians first began to be felt by the Corinthians.

Now Inarus, the son of Psammetichus, the Libyan king of the Libyans bordering on Egypt, having his headquarters at Maraea, the city above Pharos, caused the greater part of Egypt to revolt from king Artaxerxes, and being himself made ruler of it, invited the Athenians to his aid.