There is a mod that lets you become high king of Skyrim, i think it has you kill Elisif or Ulfric or gives you the option to marry one of them.
You can claim the jagged crown of the high king. You can become the thane in pretty much every hold. according to lore, the dragonborn should be powerful enough to fight anyone who disagrees with him ie the stormcloaks. As High King, you are able to drastically change the lives of all NPCs through. Adds a quest to let the player become High King of Skyrim. Gain 20 supporters to support your claim.