I've attempted to find the answer to this but am so far unsatisfied with the varied findings. So how far back have we "directly" and clearly documented history? How far back do we have documentation based off of archeological findings (ex: paintings on walls)? I ask because there is a lot of "folklore" out there and myths and what not supposedly based on history but yet we seem to not really know. Forgive me if you found these answers easily or think i should have but I've found varying answers. I will still continue searching as time allows but perhaps some shortcuts may be left here.