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".
Peroz III Peroz III (Middle Persian: 𐭯𐭩𐭫𐭥𐭰 , Persian: پیروز "the Victor"; ) was son of Yazdegerd III, the last Sasanian king of Persia. After the death of his father, who legend says was killed by a miller for his clothes and jewelry (when the governor of Merv might have been the real culprit), he retreated to territory under the control of Tang Dynasty China. He served as a Tang general and the head of the Governorate of Iran, an exiled extension of the Sassanid court. Most of what is known of Peroz is written in the "Old Book of Tang" and the "New Book of Tang".