Dear Mr Cornwell
Italy's Modena Cathedral, has a decorated arch above one of its entrances ( http://www.unesco.modena.it/it/organizza-la-tua-visita/link-cattedrale/porta-della-pescheria ) . Some think it dates from the mid 12th Century . An Italian historian friend of mine says that roving minstrels, back then, were like the internet of today and would have widely spread stories of King Arthur.
The construction of Modena cathedral is well documented and began in 1099 A.D.
The information depicted in the arch above the Porta della Pescheria was significant enough to be presented at this important place, as it was both then and now.
Do you have any thought what the significance might have been?
The very fact that I am writing to you about this draws upon the existence of this arch. Do you think it also adds support to the existence of Arthur, Lancelot and Guinevere?