Herodotos, 9.45
`Men of Athens... Had I not greatly at heart the common welfare of Hellas I should not have come to tell you; but I am myself Hellene by descent, and I would not willingly see Hellas exchange freedom for slavery.
...If you prosper in this war, forget not to do something for my freedom; consider the risk I have run, out of zeal for the Hellenic Cause, to acquaint you with what Mardonios intends, and to save you from being surprised by the barbarians. I am Alexander of Macedon.'