... There is a wonder found in the region called Ercing.  Near a fountain there is a funeral mound named Licat Anir, in memory of Anir, the son of Arthur.  Arthur himself is said to have slain the youth and buried him.  Men who come to measure the mound find it sometimes six feet long, sometimes nine, sometimes fifteen, but never twice alike.  "And I have tried it," says Nennius ("et ego... probavi").  Whether it was before or after dinner, the monk does not say. (The Arthur of the English Poets, Maynadier, 1907)