On an ERE campaign I played, I found Colchis to be a very troublesome city to hold on to. The problem was not that my army was weak, it was more than capable of fending off the Sassanids (even had some mercenary elephants). The problem was that public order would often drop to terrible levels in only one or two turns (only caused alot of rioting, no rebellions, fortunately). Eventually I realised that this was because Sassanid characters with pro-conversion traits and retinues were sitting in my province converting the population to Zoroastrianism. I am not sure if the AI was actually intending to do this, but it certainly had that effect. Fortunately because it's a small province it was fairly easy to deal with, but in large provinces it could be seriously troublesome because during the time it would take to find and fight off the interloping army the city could rebel. I tried it against the AI too, and managed to cause a couple of provinces to go rebel. However, it's mostly useful for preparing a province for takeover by your army. Might be a totally obvious tactic and I'm just dumb for only having stumbled upon it, but if you have surplus generals they can make occupations alot easier by helping to convert the population before you capture a city. I believe it can also be done with diplomats, if they have religious traits.
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