I mean, your palace may last forever, but my yurt can go anywhere. Five, the Mongols were probably responsible for the Black Death. By opening up trade, they also opened up vectors for disease to travel, in the case of the plague via fleas infected with Yersinia pestis. And at least according to one story, the Mongols intentionally spread the plague by catapulting their plague-ridden cadavers over the walls of Caffa in the Crimea. While this primitive act of biological warfare might have happened, it's unlikely to be what actually spread the plague. More likely it was the fleas on the rats in the holds of Black Sea ships that were trading with Europe, but that trade only existed because of the Mongols. All right, Stan, one last time, cue the Mongoltage.