Please be aware of the Forum Rules of Conduct.
If a noble is in his own realm's prison, then no ban is needed to deport him. I think this may apply to execution, too.
Weren't you banned in Cathay by Baudoin last year and now you're in Cathay's dungeon?How does this not end in execution? (I ask because I don't know - haven't executed anyone in years)
That's why you don't send them to the Colonies and give them a reason to get back on a ship. Send them somewhere they like to go, so they stick around!
Or what you can do is be a just and honorable realm that doesn't employ the service of vagabonds and assassins, and not give a crap about prisoner agreements, giving you the leverage needed to spill as much blood as humanly possible.That's the point of Battlemaster, right? Kill counts?
Kill Counts. A capital mistake