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.
Halfdan (floruit 782–807) Halfdan ("floruit" 782–807) was a leading person among the Danes and the first known Scandinavian to enter Frankish service. Onomastics links him to the Danish royal family since the name "Halfdan" was commonly employed both historically (as attested by the "Annales Fuldenses" under the year 873) and in the legendary royal lineage.