Well, I have it on good authority that very little of the Vampire Covenant background has been created. Pretty much the only thing published about Gilles de Raux is that he was an Equitanian vampire-king who fought off the Vermin, who successfully overran the rest of Vetia at the time. And that Gilles de Raux was eventually killed by the hero Uther, under whose leadership Equitaine was restored to its former self.
But that just means that the background is a blank slate, it can be whatever we want it to be, and it might get
Sunna is not with the big battalions, but with the ones whose parts move with the best coordination.