Short answers, pulled from the story.
No record confirms the exact birth date or place of Cnut. If he accompanied Swein's 1003 invasion of England, his birth might be near 980 or 990. If he joined the 1013 campaign instead, it could suggest 1000 as his birth year.
Cnut gained control of all England upon the death of Edmund Ironside on the 30th of November 1016. He was crowned by Lyfing Archbishop of Canterbury in London in 1017 after West Saxons accepted him as king of all England. The realm north of the Thames went to Cnut while south stayed with Edmund until Edmund died.
Cnut ruled England from 1016, Denmark from 1018, and Norway from 1028 until his death in 1035. He united these three kingdoms under one Scandinavian ruler known as the North Sea Empire. His later accession to Danish throne brought crowns together after decades of conflict.
Cnut died the 12th of November 1035 at Shaftesbury Dorset. He was buried in Old Minster Winchester following events 1066 new Norman regime keen signal authority ambitious programme grandiose cathedrals castles proceeded throughout High Middle Ages Winchester Cathedral built old Anglo-Saxon site previous burials including Cnut set mortuary chests there.
The Danes fought Edmund's army near Ashingdon or Ashdon in Essex during the Battle of Assandun on the 18th of October 1016. Eadric Streona withdrew his forces from the fray causing decisive defeat for Edmund. Cnut pursued him into Gloucestershire where another battle likely occurred near Forest of Dean.