[Oni]

I'd be inclined to say Christopher Columbus. It's often misstated that he was responsible for discovering the Americas, whereas the original discoverer was actually Leif Erikson. Adding to the hilarity, Columbus referred to the natives of the Americas as Indians because he thought he'd landed in India. Originally he was in search of a trade route for Indian/Asian silks/spices. Amerigo Vespucci doesn't tend to get talked about as much either.