Kettil Karlsson rebelled against the king of Denmark that ruled under what House?
Kettil Karlsson (Vasa):  He rebelled against King Christian I in 1463, was Captain General "(rikshövitsman)" and "de facto" regent of Sweden from February to August 1464, stepping down during the brief return of King Charles Canutesson from exile. Christian I of Denmark:  He was the first Danish monarch of the House of Oldenburg.
House of Oldenburg