I., king of Macedonia (c. 54 0 -498 B.C.), was a tributary vassal of Darius Hystaspes. With him the history of Macedonia may be said to begin. He was the first of its rulers to have relations with other countries; he entered into an alliance with the Peisistratidae, and when Hippias was driven out of Athens he offered him the territory of Anthemus on the Thermaic Gulf, with the object of turning the Greek party feuds to his own advantage (Herodotus v. 17, 94; Justin vii. 2; Thucydides 11. roo; Pausanias ix. 40). See Macedonian Empire.