Hi! Alexander,

On 05/02/2019 06:40 PM, you wrote to All:

 AK> Historical opinion is now split. Some scholars think
 AK> that the lack of contemporary accounts of Arthur mean
 AK> he is a later invention.

 AK> 1. What about the absence of article before "Historical opinion"?

There are many opinions.  I have mine.  Do you have one?

 AK> 2. why do they write "mean" instead of "means"?

 AK> IMHO the lack of ... means...

It simply implies 'it suggests', i.e. "...of Arthur suggest he is a later...". 
 Even 'implies' could have been substituted for 'means'.

An aside comment...

I will leave you with this teaser video on EwwTuub... The Sword Excalibur - The
 Truth Behind [National Geographic on Nov 17, 2011]:
https://www.youtube.com/watch?v=sAqb8XHGezI

I have seen another full-length video many years ago showing the entire
process, which formed my opinion on the probable basis (and time in history)
for the Arthurian tale.   In those times, the making of swords was wizard's
work.  8-)

There is an English phrase you may or may not have stumbled across: Great Minds
 Think Alike (sometimes abbreviated to GMTA).  I was recently doing some
haphazard research on Arthur and Excalibur.  GMTA, Alexander.

Cheers,
Paul.

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