Who is Joaquin Murieta and Why Had I not Heard of Him?

It's a real question. Why is this bandit, who terrorized people throughout 1850s California, a new discovery for me? Murieta is everywhere and nowhere at the same time. He hides behind the tale of Zoro. He lived on somewhat fictionalized in plagiarized magazine and radio serials. Countless westerns used his life as a model for their honorable bandits. But he himself is lost to time.