Mathi Stouthand has warned you of a new threat to the north of Gondamon and that maybe it is the Knight you seek.
'Golodir? I'm not familiar with him, but the Rangers helped us achieve peace here, so I will gladly aid you in this.
'I think I may know where your man is hiding. There have been many reports of new threats to the north of here. They are mostly rumours, but several of my patrols have not returned. Perhaps you could look into this problem for us?
'Report back to me if you are successful.'
The Knight of Mordirith might be found north of Gondamon.
Mathi Stouthand suggested that the threat to the north of Gondamon may be the Knight you seek.
Mathi Stouthand is at Gondamon, south of the Knight's camp.
Having defeated the Knight of Mordirith, you should return to Mathi Stouthand and let him know that you were successful.