Thrace and its surroundings were of great importance to the cities of Ancient Greece and particularly to Athens, because of it's location beyond the northern periphery of the Greek Worldthat it providing land for Athenian setters and affording control of Black Sea. And also the strong relationship between Athens and the Thracian region which extended from the mid-sixth to the mid-Fourth century B.C.
This paper studies two case: the first case is the Relationship between Thrace ands Athens during the mid-fourth century and the strategic and logistic importance of Thrace to Athens. The second case is the relationship between Thrace and Philip of Macedonia during the mid-fourth century and the importance of Thrace Philip, this importance is eloquently demonstrated in the speeches of Demosthenes, in this repeated references to Philip's actions in Thrace and the Chersonese Demosthenes was keen that the Thracians should not fall in the hands of Philip who would make use of them to provide himself with men and money and then establish himself as a master of Thrace.