Pompey stone
... that the Pompey stone was believed to date to the early 1500s for over 70 years before it was revealed to be a hoax in 1894?
... that the <b id="mwA7w"><a href="./Pompey_stone" id="mwA70" rel="mw:WikiLink" title="Pompey stone">Pompey stone</a></b> was believed to date to the early 1500s for over 70 years before it was revealed to be a hoax in 1894?