History of the Peloponnesian War

And when the oracle had answered that they should deliver it and take the Corinthians for their leaders, they went to Corinth and according to the advice of the oracle gave their city to them, and declared how the first founder of it was a Corinthian, and what answer the oracle had given them, entreating their help and that they would not stand by beholding their destruction.

And the Corinthians undertook their defence not only for the equity of the cause, as thinking them no less their own than the Corcyraeans' colony, but also for hatred of the Corcyraeans, who being their colony yet contemned them and allowed them not their due honour in public meetings nor in the distribution of the sacrifice began at a Corinthian, as was the custom of other colonies;