Quote Originally Posted by Eloah View Post
It's in the lore book itself, but it is also stated and implied subtly in the game prior to the lore books release. The Mhachi raid gives more details though. I can look for the actual page and quotes if you like but if you have the book just read the entries on Mhach and Ul'dah, and Nym and Limsa, you'll see. Now , I'm not stating the cities only had Lalafells, just that they were primarily Lalafells; Like Limsa is Roegadyn, Ishgard is Elezen, and Ala Mhigo is Hyur.
Looking at Mhach proper, all we know is that the lalafellin descendants founded Belah'dia. Within Mhach however we only find Hyur statues and mentions of a Voidmage Cessair who also happens to be Hyur. And we learn from the RDM entry that Ala Mhigo was co-founded by the descendants of mhach. At the calamity there could have been a split in Mhachi hyur/lala population with the highlanders drawing to gyr abania and the Lalafells going south.