Ancient Greece is not unfamiliar to International Relations scholars. Thucydides' History of the Peloponnesian War has been especially influential in shaping our understanding of the ancient Greek international system, not only because it is the best historical source available, but also in light of the status it has achieved as the foremost classic of International Relations. Of particular interest to International Relations have been questions concerning the character of the system and the units within it, and how these have affected the dynamics of conflict and co-operation in the international arena. Many find the antecedents of the modern European states-system in the pattern of relations that emerged between the independent city-states of Hellas roughly between the eighth and fourth centuries BC. Like our contemporary international system, the ancient Greek international system was anarchic in the sense that it lacked an overarching common government.