Pope Leo VI died in 911 AD after making this prophecy about a final Holy Emperor:

“There will arise an imperial deliverer — an oriental Frederick — who will save the kingdom and the people. He will come from the Muslims over whom he will rule — adorned with all virtue — poor but needing nothing — two angels in the form of eunuchs will accompany him — mankind will accept him as their ruler. He will conquer the Arabs — no taxes after 12 years. Immediately after, there will set in a period of darkness, crime and revolution.”