Soz wor Peg, but I'm pointing out the assumption of a medieval wall, and I don't put the text up on Stan's bumper website of cups, so tell them about the date error, not I. (Potent though the tma Eds may be here, I don't think they'll have the ability to alter the text on the Archive either...)
Personally, I shall reserve judgement about the row/wall/line-of-stones until I visit it.