Ah! Good question!
In the beginning was
Chaos. Jullian Gollop created it.
Then Chaos begin to evolve, gaining weight and suddenly
Lords of Chaos arisen and begin theirs magnificient battles.
But this is must be only one, remember? So only one remained indeed. He travels on the glorious fields of human mythology, bearing
Magic and Mayhem with him and defeating Old Evil. Then he learned
The Art of Magic and do it second time.
Well, this is the end for his history. For now.
If you are not in "second hand" software, that is. Otherwise you can also look for attempts of
different people or
other different people to recreate old magnificient Chaos.