During his long reign, Mercia became the dominant kingdom of the Anglo-Saxons, a domination that continued until the end of the eighth century.
Editors. "Æthelbald succeeds to the throne of Mercia". The Literary Encyclopedia. First published 01 May 2009
[http://www.litencyc.com/php/stopics.php?rec=true&UID=6805, accessed 23 November 2014.]