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".
Lex Burgundionum The Lex Burgundionum (Latin for Burgundian Laws, also "Lex Gundobada") refers to the law code of the Burgundians, probably issued by king Gundobad. It is influenced by Roman law and deals with domestic laws concerning marriage and inheritance as well as regulating weregild and other penalties. Interaction between Burgundians is treated separately from interaction between Burgundians and Gallo-Romans. The oldest of the 14 surviving manuscripts of the text dates to the 9th century, but the code's institution is ascribed to king Gundobad (died 516), with a possible revision by his successor Sigismund (died 523). The "Lex Romana Burgundionum" is a separate code, containing various laws taken from Roman sources, probably intended to apply to the Burgundians' Gallo-Roman subjects. The oldest copy of this text dates to the 7th century.