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".
Baderic Baderic, Baderich, Balderich or Boderic (ca. 480 – 529), son of Bisinus and Basina, was a co-king of the Thuringii. He and his brothers Hermanfrid and Berthar succeeded their father Bisinus. After Hermanfrid defeated Berthar in battle, he invited King Theuderic I of Metz to help him defeat Baderic in return for half of the kingdom. Theuderic I agreed and Baderic was defeated and killed in 529. Hermanfrid became the sole king.