Um, actually the original tales of Robin Hood had him stealing back money taken from common people by excessive taxation from the government...

But in a similar vein, maybe Nostradamus was a time traveler...

-Blast

p.s. Anyone here ever read "Lest Darkness Falls"? It was about a college professor who got sent back to the end of Roman times. He brought distilled alcohol, fumigation, perspective in paintings, and pockets in togas to the people and eventually managed to ward off the Dark Ages. It was a pretty good book.