Edward (c.874 – 924) was the eldest son of Alfred the Great. As a young man, he helped Alfred defeat the final Viking invasion of his father’s reign and then, as king, he reconquered the Danelaw, with the help of his formidable sister, Æthelflæd, Lady of the Mercians. The Last Kingdom TV series portrays him as callow and foolish. In reality, he was a formidable and determined ruler.