It was the Greeks that came up with history in the same sense that the term is used today, namely of a story (a narrative) based on historical events that tries to explain what happened and why it happened the way it did. In other words, history as it was first written by the Greeks is not just about listing facts, it is about explaining the human motivations at work in historical events and phenomena. Likewise, the Greeks were the first to systematically employ the essential historical method of using primary sources written or experienced at the time as the basis of historical research.
The founding figure of Greek history-writing was Herodotus (484 – 420 BCE), who wrote a history of the Persian War that was acclaimed by his fellow Greeks. Herodotus sought to explain human actions in terms of how people tended to react to the political and social pressures they experienced. He applied his theory to various events in the ancient past, like the Trojan War, as well as those of Greece's recent past. Most importantly, Herodotus traveled and read sources to serve as the basis of his conclusions. He did not simply sit in his home city and theorize about things; he gathered a huge amount of information about foreign lands and cultures and he examined contemporary accounts of events. This use of primary sources is still the defining characteristic of history as an academic discipline: professional historians must seek out writings and artifacts from their areas of study and use them as the basis for their own interpretations.
Herodotus also raised issues of ongoing relevance about the encounter of different cultures; despite the greatness of his own civilization, he was genuinely vexed by the issue of whether one set of beliefs and practices (i.e. culture) could be “better” than another. He knew enough about other cultures, especially Persia, to recognize that other societies could be as complex, and military more powerful, than was Greece. Nevertheless, his history of the Persian War continued the age-old Greek practice of referring to the Persians as “barbarians.”
The other great Greek historian of the classical period was the Athenian writer Thucydides (460 – 404 BCE), sometimes considered the real “father” of history-writing. Thucydides wrote a history of the Peloponnesian War that remains the single most significant account of the war to this day. The work meticulously follows the events of the war while investigating the human motivations and subsequent decisions that caused events. The war had been a terrible tragedy, he wrote, because Athens became so power-hungry that it sacrificed its own greatness in the quest for more power and wealth. Thus, he deliberately crafted an argument (a thesis) and defended it with historical evidence, precisely the same thing historians and history students alike are expected to do in their written work. Thanks in part to the work of Herodotus and Thucydides, history became such an important discipline to the Greeks that they believed that Clio, one of the divine muses, the sources of inspiration for thought and artistic creation, was the patron of history specifically.