Who was the half-brother of Sweyn Haakonsson that participated in the conquest of English by King Canute the Great?
Eiríkr Hákonarson Eric Haakonsson (960s – 1020s) was Earl of Lade, Governor of Norway and Earl of Northumbria. He was the son of Earl Hákon Sigurðarson and brother of the legendary Aud Haakonsdottir of Lade. He participated in the Battle of Hjörungavágr, the Battle of Svolder and the conquest of England by King Canute the Great.
Boleslaw of Sweden Boleslaw (Swedish: "Burislev"; died 1172/73) was a Swedish pretender for the throne, belonging to the House of Sverker. He acted in concert with his kinsman Kol against King Canute I of Sweden, then head of the House of Eric. The two pretenders, who were brothers, half-brothers, or uncle and nephew, may never have controlled much more than the Province of Östergötland, which was the base of the dynasty. Boleslaw is believed either to have been murdered by King Canute's men, or to have fled to Poland in or before 1173.