Wasn't Ælle already Bretwalda in 490? I had planned on him giving the title to Arthur after his total defeat and subsequent capture at mt.badon. i mean I'll still have him there even if the title is anachronistic/posthumus, but if it is then I need to change the titles of the anglo saxon leaders the Aurlings control too.
@Icedaemon a restricted tannistry sounds good to me, i just forgot about it while researching because the welsh never seemed to have used it.