Osbeorn Bulax's father governed on what king's behalf?
Siward, Earl of Northumbria Siward or Sigurd ( or more recently ; Old English: "Sigeweard") was an important earl of 11th-century northern England. The Old Norse nickname "Digri" and its Latin translation "Grossus" ("the stout") are given to him by near-contemporary texts. Siward was probably of Scandinavian origin, perhaps a relative of Earl Ulf, and emerged as a powerful regional strongman in England during the reign of Cnut ("Canute the Great", 1016–1035). Cnut was a Scandinavian ruler who conquered England in the 1010s, and Siward was one of the many Scandinavians who came to England in the aftermath of that conquest. Siward subsequently rose to become sub-ruler of most of northern England. From 1033 at the latest Siward was in control of southern Northumbria, that is, present-day Yorkshire, governing as earl on Cnut's behalf.
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.