Did the person known as Ceaser Augustus really exist?

uming your grandfather is now dead, did he ever really exist? All you have of him now are stories. Maybe photographs, but are they REALLY of HIM? Maybe the stories are all made up. Did George Washington ever REALLY exist? There is more evidence of him than of King George I, or of someone less famous than he, of whom there are only stories. Stories get morphed with every retelling.