bjorn bjornssen-bjornssen, son of bjorn bjornssen, son of bjorn ivarssen-ivarssen, son of ivar ivarssen, son of ivar olafssen-olafssen, son of olaf olafssen, son of olaf sigurdrssen-sigurdrssen, son of sigurdr sigurdrssen, son of sigurdr ulfricssen-ulfricssen, son of ulfric ulfricssen, son of ulfric knutssen-knutssen, son of knut knutssen, son of knut the mighty