The Sator Square (or the Rotas-Sator Square, or the Templar Magic Square) is a two-dimensional acrostic class of word square containing a five-word Latin palindrome. The earliest Sator squares were found at several Roman-era sites, all in ROTAS-form, with the earliest discovery at Pompeii (and also likely pre-A.D. 62). The earliest square that included explicit additional Christian-associated imagery dates from the sixth century, and by medieval times Sator squares had been found across Europe, Asia Minor, and North Africa. Encyclopedia Britannica called it "the most familiar lettered square in the Western world".