Æthelred's grandfather, Ecgberht, became king of Wessex in 802, and in the view of the historian Richard Abels it must have seemed very unlikely to contemporaries that he would establish a lasting dynasty. For two hundred years, three families had fought for the West Saxon throne, and no son had followed his father as king. No ancestor of Ecgberht had been a king of Wessex since Ceawlin in the late sixth century, but he was believed to be a paternal descendant of Cerdic, the founder of the West Saxon dynasty. This made Ecgberht an ætheling – a prince eligible for the throne. But after Ecgberht's reign, descent from Cerdic was no longer sufficient to make a man an ætheling. When Ecgberht died in 839 he was succeeded by his son Æthelwulf; all subsequent West Saxon kings were Ecgberht's descendants, and were also sons of kings.