Thucydides was an Athenian historian and general. His History of the Peloponnesian War recounts the 5th century BC war between Sparta and Athens until the year 411 BC. Thucydides has been dubbed the father of "scientific history" by those who accept his claims to have applied strict standards of impartiality and evidence-gathering and analysis of cause and effect, without reference to intervention by the gods, as outlined in his introduction to his work. c. 460 BC – 395 BC; died at about 66. Alive at the same time as Plato, Sophocles, Hippocrates, Socrates, and Euripides. Wiki link