What happens when you deposit a lord in an ally's dungeon, versus stashing him in your own? Will the dungeon owner leave him imprisoned until he escapes, or can he/will he just cash him in?
I sometimes wonder, when I have a captured faction leader, what the best thing to do with him is vis-a-vis winning the war, forcing a favorable peace treaty, etc. Should I:
1. Deposit him in the nearest dungeon available.
2. Deposit him in my own dungeon, though it might be far away and he might escape en route.
3. Gift him to my own king?
Upfront: I don't know the answer, so take my speculation with a grain of salt. But I suspect the answer might be "put him/her in the nearest own-faction castle
dungeon". Reason: castles don't have ransom brokers. If you pop the lord into a town dungeon, then that town's AI owner only has to visit and cash the prisoner in. But if in a castle, then the AI owner has to a) visit his/her castle, b) take the prisoner lord into party, and c) transport the prisoner to a town to ransom. I somewhat suspect that chain of linked actions is probably beyond the parameters of the AI? Maybe? Maybe not? (obviously, this rationale wouldn't apply if the nearest dungeon is in your own player-controlled town.)
All that said, it's probably still better to lug the prisoner to one of your own dungeons if at all feasible. It's better to know
instead of hope that the prisoner won't be ransomed off prematurely.
Obtw, was surprised in my current playthrough (1.4.1) that I held Raganvad in my own (castle) dungeon for almost a month. So yeah, they still need to do more work on how long captured lords stay in chains...but it is
slowly getting a little better.