Herdwick sheep were probably introduced by Norse settlers during the Viking invasions (10th-11th c.). The husbandry of the sheep has been a large factor in shaping the culture & terrain of the Lake District. Beatrix Potter was involved with breeding Herdwicks & bequeathed 15 farms to the National Trust. Per her instructions all continue to graze Herdwick flocks.
Ulfhednar An interesting depiction of Norse myth. Such skin-changers are now called Werewulf, or loup garou, In ancient times it was respected as a warrior--not a monster. Their ferocity in battle was much admired. Even in the Middle Ages, when such sorcery was condemned as witchcraft, one accused werewolf asserted that, far from consorting with the Devil, he was "God's Dog." For more on the subject, see chapter 15, Dixie Spirits: http://www.sourcebooks.com/store/dixie-spirits.html