Well, exile is basically trying to remove someone from that hierarchy, so I don't really see your point Dante.
Trying to remove someone from the hierarchy and actually doing so are two different things though.
If someone owns land and has lords who give him their fealty, then they get their taxes. No ruler ever could simply say, okay you're gone, and expect it to stick 100% without any dissent if a Lord had such popularity. (In this case, assuming Royal = popular, because the royalty thing never really existed IRL)
