Where do people stand on this guy's origins now that stuff like Ivalice, Bozja and the Republic of Landis are places generally associated with Yasumi Matsuno's work?

I know there isn't much to go on with this guy other than "He comes from a faraway land, died at one point and came back as a Lich to bother the people of the Shroud".

But I wonder how does the community find him? Do people think
  • He came from Tactics Ogre directly via some interdimensional passage?
  • Or did he come from one of those Yasumi Matsuno-inspired regions?