Question: Ivar the Boneless was the brother of which 9th century Viking chieftain?
Sentence (from "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.
Relevant evidence: Yes