The Anglo-Saxon Chronicle records that in this year Alfred ‘occupied London’ and received the submission of all ‘Angelcyn’ not under Danish rule. Alfred perhaps took control of London from his son-in-law Æthelred of Mercia rather than the Danes, uniting Wessex and Mercia for the first time.
Hicklin, Alice. "Alfred the Great reconquers London from the Danes". The Literary Encyclopedia. First published 29 June 2016
[http://www.litencyc.com/php/stopics.php?rec=true&UID=6990, accessed 01 September 2016.]