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Thucydides (Greek Historian)
Thucydides was an ancient Greek historian and author of the History of the Peloponnesian War, which recounts the 5th century BC war between Sparta and Athens to the year 411 BC. Thucydides has been dubbed the father of "scientific history" due his strict standards of evidence-gathering and analysis in terms of cause and effect without reference to intervention by the gods.
He has also been called the father of the school of political realism, which views the relations between nations as based on might rather than right. His classical text is still studied at advanced military colleges worldwide.