This is a post from Reddit that I Thought it would be worth to discuss here.
https://www.reddit.com/r/ffxiv/comme..._previous_ffs/This probably has been noted before, but Garlean legion numbers seem to be related to story references to other FF games.
Nael van Darnus was the legatus of the VII legion, he was the responsible for project Meteor (FFVII reference)
Gais van Baelsar was the legatus of the XIV legion, I assume this was trying to point out that the story surrounding him is XIV original.
Regula van Hydrus is the legatus of the VI legion, he's involved in the arc of the Warring Triad (FFVI reference)
Now it was announced that in Ala Mhigo we'll be dealing with Zenos yae Galvus, legatus of the XIIth Legion.
I don't know much of Final Fantasy XII, but the story of that game might provide hints of what the main story of 4.0 in Ala Mhigo will be about.