Well, it's kind of hard to tell for sure. There are claims that it has some roots in reality, but it could also be largely fictionalized for dramatic effect.
I'm not sure. Some say it's inspired by real events, but it might have fictional elements mixed in.
I think it's a bit of both. Maybe there's a kernel of truth to it, but the story as presented could have been embellished and adapted to make it more captivating for the audience.