system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel] What is the earliest known mutant.

I know public knowledge of mutants is relatively recent, but what is the earliest known example of a mutant? Or, what theories are there of ancient mutants?
gpt
The oldest known is Apocalypse.  Born as "En Sabah Nur" in ancient Egypt he has gained power through his mutant ability and through alien technology.  

However, now that the Celestials have him and have made their judgment, it is impossible to know if he is still alive.  Only he might know of an older mutant's existence.