Freca

The Dunlending Chieftain Freca who in Third Age 2754 attempted to arrange a marriage between his son Wulf and the daughter of Helm Hammerhand. When Helm refused, Freca reviled and raged against him. Angered, Helm struck Freca so hard it killed him.

This was the start of the animosity between the Rohirrim and the Dunlendings that would last for centuries.