whom did he defeat?
Beornwulf of Mercia
Ecgberht, King of Wessex
In 825 Ecgberht defeated Beornwulf of Mercia, ended Mercia's supremacy at the Battle of Ellandun,
when was ecgberht, king of wessex born? 771/775 did he lead his kingdom in any battle? Yes, Battle of Ellandun. did he succeed in that? Yes
wiki:11542361
Ecgberht, King of Wessex [SEP] Introduction
In 825 Ecgberht defeated Beornwulf of Mercia, ended Mercia's supremacy at the Battle of Ellandun, and proceeded to take control of the Mercian dependencies in southeastern England. In 829 he defeated Wiglaf of Mercia and drove him out of his kingdom, temporarily ruling Mercia directly. Later that year Ecgberht received the submission of the Northumbrian king at Dore. The "Anglo-Saxon Chronicle" subsequently described Ecgberht as a "bretwalda" or 'wide-ruler' of Anglo-Saxon lands. Ecgberht was unable to maintain this dominant position, and within a year Wiglaf regained the throne of Mercia. However, Wessex did retain control of Kent, Sussex, and Surrey; these territories were given to Ecgberht's son Æthelwulf to rule as a subking under Ecgberht.