It's a fool's errand, but it's entertaining to see what people have come up with.

Along these lines is the story of Emperor Jimmu - the "first emperor" of Japan. He just happened to unite Japan ~ 400 years before Qin Shi Huang united China. Imagine that! ;-)

Even if quasi contemporaneous writing and evidence existed, it could still be suspect. Stuff written decades or hundreds of years later is almost always automatically suspect.

Cheers,
Scott.