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".
Sancho III of Pamplona Sancho Garcés III ( 994 – 18 October 1035), also known as Sancho the Great (Spanish: "Sancho el Mayor" , Basque: "Antso Gartzez Nagusia" ), was the King of Pamplona from 1004 until his death in 1035. He also ruled the County of Aragon and by marriage the counties of Castile, Álava and Monzón. He later added the counties of Sobrarbe (1015), Ribagoza (1018) and Cea (1030), and would intervene in the Kingdom of León, taking its eponymous capital city in 1034.