Is There Any Evidence for These Numbers?

There is no evidence for any of those claims from earlier than about 11 hundred with the exception of guenevere and avalon being at glastonbury. Thereis just no reference at all to arthur being a king, having that position or title from any earlier than one thousand so about 500 years after his supposed reign. So these last four, i would say, are basically disproved. Number 14, arthur's followers were knights, knighthood, chivalry. And number eight, arthur had a sword called something like califern or caliburnus, which represented his authority. But those are only corroborated by that lead cross, which is of highly dubious authenticity.