Moogle mog predates history?

[lackofwords]

I don't recall reading that he associated with the Twelves, not even in-game... perhaps I've missed something?

Source material on the old lodestone;
http://lodestone.finalfantasyxiv.com...233e750c07c9f8

Good King Moggle Mog XII Cometh! (12/12/2011)

http://lodestone.finalfantasyxiv.com...ews/num04.html

Grand Companies of Eorzea Page Updated! (02/02/2012)
Return of the Good King
The latest edition of The Raven, Gridania’s leading tabloid, has just gone to print, featuring as its centerpiece a special report examining fantastical claims that a moogle myth has come to life.

[Anonymoose]

I don't recall reading that he associated with the Twelves, not even in-game... perhaps I've missed something?

I don't remember it being referenced directly in the game, either. It is in that second resource, though.

The legend holds that, in a time long forgotten, the moogles dwelled in the heavens alongside the Twelve. However, a great war broke out among the gods, and the celestial realm was laid to waste. Upon seeing this, the reigning moogle monarch, Good King Moggle Mog XII, lowered his subjects down a rope—the longest ever woven—to the realm of mortals, that mooglekind might again know peace.

[dubstephalflife]

What I don't get is why do we have to kill him? Moogles are not war-like, so what do we have to fear if the Moogles summon their king?

I just ran the intro quest for this last night (I haven't finished the trial yet). The conversation between Kuplo Kopp and the mooglesgard seem to imply that the false GKMM wants to commit mass genocide, purging the Shroud of his enemies. I don't recall them saying who his enemies are (elementals, hyur, elezen, jumping djiggas), but it's probably not a good idea to let him go purging enemies.