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When it comes to Ancient history a good place to start is always from the Father of History, Herodotus of Halicarnassus. While opinions on him vary, he is still the place to dip into. He touches on many areas.
In its entirety
Or if you want to only read about the Persian War
Marathon
Thermopylae
A great History Channel Documentary (DVD)
Thucydides’ The Peloponnesian War
