From the History Channel, "According to legend, Nostradamus once encountered a young Franciscan monk herding pigs in Italy. To the surprise of onlookers, Nostradamus respectfully addressed the lowly monk as "Your Holiness." In 1585, years after Nostradamus died, that monk, Felice Peretti, became Pope Sixtus V."
I find Nostradamus to be a gifted man, but I also think some of the interpretations of mankind to be a bit fixated. Another words, we push the point to fit the prophesy. Nostradamus also believed pills made of rose petals would keep away the plague, and that the world will end in 2012. But if you read on he also believed it would end in 3797. So?