Kanwulf the Destroyer was born in 802 in Halfs Fjord, Norway. He was first killed in 834 during a raid on an English town. He revived as an Immortal. Kanwulf was found by the Immortal, Hubba, who taught him what he was, and the rules of the Game. Kanwulf eventually met the young Immortal, Martin Hyde, in England, and became his teacher.In 1624, he and his men raided into Scotland, to the small village of Glenfinnan, and slaughtered many people, including Ian MacLeod, the clan chieftain, and father of Immortal, Duncan MacLeod.
Kanwulf was then hunted by MacLeod, who sought vengeance. MacLeod, Immortal only for a few years, he had as yet, no teacher, and knew none of the rules of his new existence. The moment he met Kanwulf was the first he would sense the presence of an Immortal. Kanwulf and MacLeod fought, and Kanwulf fell to the Highlander, but MacLeod was as yet unaware that the only way for Kanwulf to really die was to behead him. MacLeod thought his enemy dead, and took Kanwulf's battle axe, burying it with his father. The battle axe was Kanwulf's most prized possession.
In 1995, Kanwulf returned to Glenfinnan to find his axe after a brooch that belonged to him turned up in Norway that he could trace to the place in Scotland where he lost the axe. He killed the local priest and assumed his identity; Father Laird. Kanwulf decided to dig up the 17th century graves to find his weapon, but some of the artifacts Kanwulf found, he sold off; such as the bracelet that Duncan MacLeod had given to his first love, Debra Campbell, over 370 years previously. The bracelet was spotted at an auction in Paris by MacLeod, who bought it, and then returned to Scotland after 250 years away, in order to return it to Debra's grave. Kanwulf's incidental murders, however, had stirred up the village legend of "Kanwulf the Destroyer", a legend which foretold the return of Kanwulf, and a member of the MacLeod clan who would return to defeat him.
Duncan returned to his village to a less than welcoming atmosphere. All of the locals were focused on the ongoing murders and grave robberies. MacLeod, being an outsider, was viewed with suspicion. While Duncan scoured the countryside looking for Debra’s grave, he was unknowingly followed by the inn manager, Rachel MacLeod. She witnessed Duncan return the bracelet to the grave, but assumed he was grave robbing, and contacted the police. While Joe and Duncan were discussing Kanwulf, the police burst into the room, and while searching the room, found his katana, and confiscated it.
It was not until they found the Celtic bracelet in a grave, returned there by MacLeod, that Rachel realized she'd been wrong, and ultimately trusted in Duncan, offering him his father’s claymore to face Kanwulf.
Kanwulf was staying at the church where he requested MacLeod visit him. It was only then that MacLeod realized who he was to face. Duncan dug up the axe, and battled Kanwulf whom he defeated and received his Quickening, avenging his father's death.
Kanwulf preferred a Viking fighting axe which he had named Bloodstealer Ragnor. It was a bearded axe with a broad convex blade. He also used a Viking Sword, similar to the roman Spatha, during battle and blood sacrifices. In 1635 Duncan MacLeod took the axe after his defeat of Kanwulf, and buried it in his father's grave, where it lay for 360 years, until Kanwulf's final challenge, defeat and death.