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".
Sweyn Forkbeard Sweyn Forkbeard (Old Norse: "Sveinn Haraldsson tjúguskegg"; Danish: "Svend Tveskæg"; 960 – 3 February 1014) was king of Denmark during 986–1014.