The causes of the fluctuating fortunes of Mercia and Wessex are a matter of speculation, but it may be that Carolingian support influenced both Ecgberht's ascendancy and the subsequent Mercian recovery.
As causas da sorte cambiante de Mercia e Wessex son materias suxeitas á especulación, pero podería ser que o apoio carolinxio influíse no ascenso de Ecgbryht e a posterior recuperación mercia.