What happened to the AI?

[Loren]

Ulm, a difficult AI.

They *NEVER* did anything. Their army never increased, they never built anything, never took anything, never researched anything. The army size slowly wore away, they were seiged for a long time and finally vanished.

What in the world could have caused this? The only game mechanic that I can think of that could do this is unrest over 100 but how could that have happened for years?


(I also had a related experience not too long ago. I found unrest over 400 in a province. As far as I can tell it was nowhere near the battle lines--I got it from a dominion kill, not combat.)