There is a famous story told by the English printer William Caxton in the introduction to his 1490 edition of the Aeneid, about a group of merchants headed from London to Denmark who stopped along the way at a woman’s house to see if they could get something to eat. One of them, from the North of England, asked if she had any eggs, and she replied that she didn’t speak French, something that must have confused them both, until one of his companions stepped in and told the woman that he wanted eyren. The woman was as English as the merchant, but the problem was caused by a difference…