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.
Halfdan the Mild Halfdan the Mild (Old Norse: "Hálfdan hinn mildi ok hinn matarilli", (meaning the generous and stingy on food)) was the son of king Eystein Halfdansson, of the House of Yngling and he succeeded his father as king, according to Heimskringla. He was king of Romerike and Vestfold.