Source of inspiration: the Roland Emmrich movie 10,000 BC, and how he gets the girl of his dreams with a few deceptive one-liners, frees an empire from tyranny with one shot from a spear, knows when to call for help, and fulfills a prophecy fortold on a painted rock, how he will one day meet a sabretooth tiger … and live. And how his name “held” is german for … hero. 
To see humans go further back in time, check out:
100 Million BC
Army guys! Time travel! Dinosaurs!
