Oh ok, so the espers were just chillin for some of the war?

I found some info on some of the espers from my old Anthologies save that I thought was interesting.

Golem- "Like Alexander, this Esper was made before the war."

Alexander- "Mages brought this ancient machine to life"

So, we can assume that these two espers were basically creations? Thats cool, can anyone give some background info on them, if any background info exists at all?