Ivar the Boneless was the brother of which 9th century Viking chieftain?
Ubba Ubba, also known as Hubba, Ubbe, and Ubbi, was a mid-ninth-century Viking chieftain and one of the commanders of the Great Army, a coalition of Norse warriors that in AD 865 invaded the Anglo-Saxon kingdoms of Northumbria, Mercia, East Anglia and Wessex.
Sigvaldi Strut-Haraldsson Jarl Sigvaldi was the semi-legendary chieftain of the fabled Jomsvikings and commander of their stronghold - Jomsborg. He succeeded Palnatoke as the leaders of the Jomsvikings in the late 10th century. The character of Sigvaldi remains largely enigmatic. As a leader, he was said to be more wily than brave despite leading such a powerful force.