Grettir

The Grettir are a lost clan of Kindred native to Scandinavia. They are alluded to as the ancestors of the Norvegi bloodline, who in modern nights are part of Clan Mekhet. Supposedly the Grettir became "inbred" due to a combination of Embracing their mortal relatives (who were inbred in the more literal sense of the term) and a pervasive practice of diablerie and Vinculums that somehow weakened the blood.