It's all about scope though. Sure he might have lived a couple of thousands of years ago. Humanity still is only a blip on the whole history of the earth.

Maybe in 100.000 years even he will be forgotten as well, but he did get his 15 minutes of fame (relatively speaking), I'll give you that :)

Perhaps the easiest way to secure a legacy is creating the long lasting object with whichever claims you’d like and skipping the actual building of the kingdom

I like that thinking.. I am going to create my own history kinda like how the man who claimed to have conned everyone was lying about him conning everyone (and thus conning a different set of everyone :) )