The Histories/YMMV

• Exclusively Evil: As a moral relativist, Herodotus usually abstains from judging other cultures, but occasionally describes peoples as this, such as the cannibals from beyond the black sea.
• Complete Monster: Cambyses
• Vindicated by History: The Histories has always been considered a classic, but it was more for its literary merit than historical. Herodotus was called "Liar" in his own time and widely accused of making the whole thing up. Modern archaeologists and historians, however, have corraborated many of his stories. Today it's believed he was accurately retelling stories that the locals he spoke to believed to be actual history.