On this page of the Assassin's Creed Valhalla game guide, you will find a detailed walkthrough description of the quest The False Ealdormancy.
Rewards: 1,200 XP.
In the place marked in the image above, you will find a wanted poster for Hunwald, nailed to a tree with a knife. Wait a while at this point.
After some time, a soldier appears on the scene along with a man who explains that he is no Hunwald, and that his name is Roderick. Get rid of the soldier and speak with the man to complete this task.