I'm a king of feudal gavelkind kingdom. My direct vassal count of my kingdom de jure county inherited a duchy outside my de jure kingdom. I was surprised when he left my realm upon inheritance. This question explained why this happened - rank-defining title made him independent (I suspect that in m y case because he made new duchy his primary title and declared independence due me not being his de jure liege).
What could I have done to prevent that from happening?
- Does result vary if inheriting vassal is/is not of my dynasty?
- Kingdom law (controlled inheritance/strong crown authority)?
- Would he stay in the realm if he was originally holding a duchy title in my de jure kingdom?