No Saxon invasion?

[Alanus]

I'm not sure that the tapestry counts as archaeological evidence, or more to the point, why the writings of Bede or Nennius would not have equal historical credibility. The Notitia Dignitatum and its information on the Saxon Shore commands and forces also seem to have been ignored as 'archaeological evidence' of a Saxon threat (or at least the attempt to organize a defense against it).

I can understand why "history revisionists" might not include Nennius and Bede, both authors writing long after the fact, starting 400 years later.

But as you say, the Notitia Dignitatum is not a piece of fiction.
And neither was the complaint of Gildas, who personally knew survivors of the "non-invasion."