Troytonia

Rome with long sleeves. Troytonia is the biggest and oldest empire in Accoria. Its collapse triggered the first great Dark Age. Here's what happened after that in LOM:

If you're familiar with the fall of the Roman Empire (a fascinating period, btw), there wasn't really one point when everyone looked around and said "Welp, the Roman Empire has now collapsed. Hey, y'all wanna to go fight Vikings?" No. The Empire had been around for so long, people couldn't fathom the idea of it just vanishing. Sure, Roman soldiers hadn't come for a while, and the government had moved to Ravenna instead of Rome. But that was just temporary. It didn't change the fact that they were part of the mighty Roman empire. Alaric, the fellow who sacked Rome in 410, wasn't some wild barbarian from the depths of Germany. He was a commander in the Roman Army, and he raided Rome because he wanted pay for his army. In other words, even after the Empire had ceased to exist as a government, people still believed in the idea of the Empire.

I imagine basically the same thing happening after Troytonia collapses. Probably magnified, given how long Troytonia existed and how vast the empire was. So the Troytonians probably came to LOM as a garrison for the islands, and even though they don't have the ships to get home, they haven't heard anything from Nasitadel in centuries, and they have basically zero political power: they still preserve this almost religious faith in the Empire enduring. That faith, and the fact that their tiny army is so tactically effective, explains how ~350 people have preserved what's now a Troytonia-in-exile.