The story is told that because of an oracle the Athenians invoked Boreas, the north wind, to help them, since another oracle told them to summon their son-in-law as an ally. According to the Hellenic story, Boreas had an Attic wife, Orithyia, the daughter of Erechtheus, ancient king of Athens. Because of this connection, so the tale goes, the Athenians considered Boreas to be their son-in-law. They were stationed off Chalcis in Euboea, and when they saw the storm rising, they then, if they had not already, sacrificed to and called upon Boreas and Orithyia to help them by destroying the barbarian fleet, just as before at Athos. I cannot say whether this was the cause of Boreas falling upon the barbarians as they lay at anchor, but the Athenians say that he had come to their aid before and that he was the agent this time. When they went home, they founded a sacred precinct of Boreas beside the Ilissus river.