Thirty years of Danish raids on the east coast of England precede the arrival in East Anglia of a large army equipped for conquest, led by King Ivar the “Boneless” and King Halfdan.
Editors. "A great Danish Viking army invades East Anglia". The Literary Encyclopedia. First published 01 May 2009
[http://www.litencyc.com/php/stopics.php?rec=true&UID=6968, accessed 30 May 2015.]