Osbeorn Bulax's father governed on what king's behalf?
Osbeorn Bulax Osbeorn (died c. 1054), given the nickname Bulax, was the son of Siward, Earl of Northumbria (died 1055). He is one of two known sons — probably the older — of Siward. While it is normally assumed he was the son of Siward's Bamburgh wife Ælfflæd, it has been suggested by William Kapelle that Osbeorn's mother was not Ælfflæd. The nickname "Bulax" probably represents the Old Norse term for "Poleaxe".
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.