In 1868 a painted fragment of wall plaster was taken from the dirt of a Roman villa under excavation near Victoria Road, county Gloucester, of south-central England. Its removal was attended by a Captain Abbott, then curator of the Cirencester Museum nearby. Scratched into the ochre surface of the unearthed plaster was the following palindrome, arranged in the form of a magic square.
Borgmann, Dmitri A.
"Palindromes: The Rotas Square,"
Word Ways: Vol. 12
, Article 2.
Available at: http://digitalcommons.butler.edu/wordways/vol12/iss4/2