The annal for 728 in the "Anglo-Saxon Chronicle" referred to a certain Oswald as an ætheling, due to his great-great-grandfather having been King of Wessex. From the 9th century, the term was used in a much narrower context and came to refer exclusively to members of the house of Cerdic of Wessex, the ruling dynasty of Wessex, most particularly the sons or brothers of the reigning king. According to historian Richard Abels "King Alfred transformed the very principle of royal succession. Before Alfred, any nobleman who could claim royal descent, no matter how distant, could strive for the throne. After him, throne-worthiness would be limited to the sons and brothers of the reigning king." In the reign of Edward the Confessor, Edgar the Ætheling received the appellation as the grandson of Edmund Ironside, but that was at a time when for the first time in 250 years there was no living ætheling according to the strict definition.