Wikipedia
Æthelmund
Æthelmund, an Anglo-Saxon noble, was Ealdorman of Hwicce in the late 8th and early 9th centuries. He was killed in 802 at the Battle of Kempsford by Ealdorman Weohstan and the levies of West Saxon Wiltshire.
Æthelmund's predecessors had been kings, but he was a subject of the King of Mercia. However in one source, the 14th century Chronicon Vilodunense or Chronicle of Wilton Abbey, he is referred to as "King of the March". Hence he may have also assumed the title of subregulus like his predecessors.