Billy the kid wasn't a frickin hero, and Robin Hood was a myth, come on guys, think of some real hereos

it's not just about heroes its about historical figures guy, and besides a work of fiction can do whatever it wants with out boundaries.

It's not about heroes but historical figures guy, the writers can choose who ever they want fictional or real. Besides I wouldn't consider Beethoven, Thomas Edison, or Newton heroes.

Actually, Robin Hood was believed to have existed but not to the extent of the stories, such as Robin Hood being a description and not an actual name. You can even get that much info off the wikipedia page let alone primary school level history books.

Honestly the context of hero in a historical sense isn't based on heroic or noble deeds. What defined a person as a Heroic Luminary is the accomplishments they have made in their life that made their name known within history. Like the Ancient Roman Gladiators who killed each other for the sake of blood sport were often hailed as heroes in the Coliseum for their win records. There was absolutely nothing noble or heroic about what they've done. Also while Nobunaga is hailed to bs a hero for first unifying Japan, he did so through brutal conquest. He is no different than Joseph Stalin or Hitler who've abused their power for the sake of their country.