Scotland Pictland's King Ciniod of house Uib is in a strange situation. From what I can tell, the kingdom has changed hands between his dynasty and the Circinn dynasty a couple times, with 200 years where the Uerturio family were in charge.
Ciniod is actually the first King of Pictland since before that time, with the Circinn's holding it for a while.
I'm not sure how, though.
See, there's a tangle - Ciniod is king, and holds a lovely demesne of two counties. Plus one vassal - an Uib duke who holes the other eight. Yeah, one vassal with 4x the territory as the king. How did this come to pass?
It's further complicated since these are feudal societies, not tribes. So King Ciniod doesn't get to call raiders from the duke's lands. And, horror of horrors, when the King takes a few losses in retaking ancestral Pictish lands, the duke raises a flag of revolt. With his chiefs choosing to aid him.
He lost, obviously, because I am King Cinoid. As a master of finance I hired some mercenaries, and then also promised a lot of usury to some moneylenders. It's not heresy if it works
And the best part, which I wasn't at all sure about, is that this act of treason voided the scum's rights to the duchy (Petty Kingdom, technically). Not just for him, but for his family. Murderers caught in the act can be forced to abdicate to their children, but this poor soul just broke the feudal-
No wait, this isn't feudal, it's tribal. Hm. I guess he was just brazen enough, and failed hard enough, that people accept my judgement as victor and king.
Crusader Kings 2
Edit: Ah F me, I'm owned. No vassals would object because he's literally a traitor, but we don't have laws for revocation of titles. F!
Edit2: Banishing him (such that his child inherits) is seen as unjustified, this is craaaap. They'd be LESS annoyed if I cut his head off, even though that's mechanically very slightly better for me: his child still inherits, but he doesn't sit around some foreign court with a pressable claim).
What an asshole. oh no he fell in the oubliette oh nooooo