The Peloponnesian War was a conflict between the Greek city-states, Athens and Sparta, from 431 BC that brought an end to the Hellenic age of Pericles and his empire by the succession of Sparta by the end of the war. Thucydides is seen as a ‘proto-realist’, one of the first realists in the study of politics that wrote in a more theoretical sense, as well as the founding father of International Relations. His study on the History of the Peloponnesian War provides awareness of the conflict and various analyses on the causes of the war by observing the strategic interaction between the states, hierarchy amongst the states along with legitimacy and levels of power to determine the pattern of their relations. Although there are undeniably numerous differences between Thucydides era and our world system today, Thucydides persists to influence contemporary international relations, namely Realism, with many realists frequently referring to the Melian Dialogue when advocating a power-based approach. With Thucydides often portraying insights into human nature, many scholars use his findings as a guide that is still relevant today due to the generality of self-interest, fear and power maximisation that still occurs as it did previously. Thucydides’ relevance today has been greatly perceived through his impact upon political realism in his studies concerning the concept of power politics. Whilst political realism expresses the view that international relations is the battle of self-interested states that are involved in the struggle of power politics within a permanent moral-free state of anarchy, Thucydides’ work denotes that international relations is anarchical and dissolute. When analysing the strategic interaction of states and the hierarchy amongst them he observes that the systems order is shaped by the powerful in order to inflict their power to sustain their