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. Æthelberht was able to arrange a meeting in 602 in the Severn valley, on the northwestern borders of Wessex, however, and this may be an indication of the extent of his influence in the west. No evidence survives showing Kentish domination of Mercia, but it is known that Mercia was independent of Northumbria, so it is quite plausible that it was under Kentish overlordship.