Ok, I found the quote from Herodotus, it claims mysians invaded europe with Teucrians before the trojan war, subdued the thracians and made it all the way to the Ionian sea and Peneios river in Greece:
"For of all the armies of which we have knowledge this proved to be by far the greatest; so that neither that led by Dareios against the Scythians appears anything as compared with it, nor the Scythian host, when the Scythians pursuing the Kimmerians made invasion of the Median land and subdued and occupied nearly all the upper parts of Asia, for which invasion afterwards Dareios attempted to take vengeance, nor that led by the sons of Atreus to Ilion, to judge by that which is reported of their expedition, nor that of the Mysians and Teucrians, before the Trojan War, who passed over into Europe by the Bosphorus and not only subdued all the Thracians, but came down also as far as the Ionian Sea and marched southwards to the river Peneios."