There is no evidence that Æthelberht's influence in other kingdoms was enough for him to convert any other kings to Christianity, although this is partly due to the lack of sources—nothing is known of Sussex's history, for example, for almost all of the seventh and eighth centuries.
Non hai probas de que a influencia de Aethelberht sobre outros reinos fora suficiente para converter ningún outro rei ao cristianismo, aínda que en parte esta interpretación se debe á falta de fontes, —por exemplo, non se sabe nada da historia de Sussex durante case todo o século VII e VIII.