Ethelred was born in 968. Ethelred became king of England in 978.
Ethelred Edward was only 10 years old when he was murdered. But Edward was killed because of Ethelred's supporters. So the British lords and their people did not obey Ethelred. Ethelred's orders have not been fulfilled to a great extent.
Meanwhile, the Vikings were strengthened from scratch. And the Vikings fought against England. The first battle was lost and Ethelred accepted the Vikings to pay a very large annual tax. But Vikings attacked England again. In this battle the Vikings conquered England. After this war Ethelred had to leave England.
Ethelred was deal British lords and some Vikings to save the UK. On this count, Ethelred gathered a great army. And Ethelred conquered most of England.
But the Viking danger continued. Ethelred tried to combat these problems. But because the people of England did not believe in Ethelred, Ethelred could not fully solve these problems.
Ethelred passed away in 1016