But Dunstan was not to rule much longer. In 978 his young master was cruelly murdered by his step-mother, Queen Aelfthryth, who knew that the crown would fall to her own son if Edward died. For one day the king chanced to ride past her manor of Corfe, and, stopping at the door, craved a cup of wine. She brought it out to him herself, and while he was drinking it to her health, one of her retainers stabbed him in the back. His horse started forward, and he lost his seat and was dragged some way by the stirrup ere he died. The queen's friends threw the body into a ditch, and gave out that he had perished by an accidental fall, but all the realm knew or suspected the truth. [Sidenote: =Aethelred the Redeless, 978-1016.--Decline of the kingly power.=] Nevertheless, Aelfthryth's boy Aethelred got the profit of his mother's wicked deed, for the Witan crowned him as the sole heir to King Eadgar. His long reign was worthy of its evil commencement, for it proved one unbroken series of disasters, and brought England at last to the feet of a foreign conqueror. He ruled for thirty-eight years of misery and trouble, for which he was himself largely responsible, for he was a selfish, idle, dilatory, hard-hearted man, and let himself be guided by unworthy flatterers and favourites, who sought nothing but their own private advantage. Wherefore men called him Aethelred the Redeless, that is the ill-counselled, because he would always choose the evil counsel rather than the good. Yet the king was not wholly to blame for the misfortunes of his reign, for the great ealdormen had their share in the guilt. Freed from the strong hand of Dunstan, who was soon driven away from the court, they acted as independent rulers, each in his own ealdormanry, quarrelled with each other, and disobeyed the king's commands. It was their divisions and jealousies and selfishness that made the king's weakness and idleness so fatal, for, when they refused to obey, he neither could nor would coerce them. [Sidenote: =Viking invasions.--The Danegelt.=]