A Count under a Duke vassal of mine, inherited a Duke-level title (Petty Kingdom)… and now he's independent.
I assumed that since King>Duke, he would still be my vassal, but this didn't happen.
Is that because he's not my direct vassal, and his liege was a Duke, ignoring that that Duke herself had a King liege?
Or would that have happened anyway for other reasons?
(maybe my Duke was a Grand Mayor actually, in case this changes anything, while the Count was a regular noble)