Board Thread:Episode Discussion/@comment-24993958-20161119160425/@comment-27082610-20161122013018

ChishioKunrin wrote:

And back before we knew that Maidens were added last minute, I theorized that the four original Maidens helped lead to the establishment of the four kingdoms by protecting settlements in those areas, with Fall protecting Vale, Winter protecting Atlas (actually, it'd be Mantle), Spring protecting Mistral, and Summer protecting Vacuo.

I mean, that could still be the case. The WoR videos didn't necessarily discount it.