
Also, once the duke dies, there is little assurance his successors will like me as well. However while picking a -100 vassal is obviously undesirable, in practice the boost from being made Duke ensures that whoever I pick will have a pretty positive view of me anyway - so the revolt risk is low either way. I generally pick the count in the duchy's territory who likes me the most to minimize revolt risk. However, I am actually not sure how to pick the best duke. If duchy does not exist, I create a duchy, and then do this. To resolve this, I go to duchies I don't want, pick one of the counts in that duchy, and make them duke.

After successful military campaigns, I often end up earning the ire of my vassals for "too many duchies".
