The Tabula Peutingeriana scroll dates from the late 12th or the early
13th century and was made in Southern Germany or Austria.
But Mr Fingernagel says it is very different from other medieval maps and is clearly a copy of a much earlier document, dating back to the 5th century.
"In maps from the 12th or 13th century, Jerusalem, not Rome, was in the centre," he said.
What they knew then, Olmert will never understand, it seems.