This is Pope Adrian 1st long time friend of Charlemaigne. It was decided Jesus should be taught as the son of God. That is a cannon on the coin. It is not known if the Mongols were building cannons for the Vatican and Charlemagne or if it is the cannon of Vespacian hid by christians in the catacombs that Josephus was so enthusiastic about http://www.nylicsocialworkeramazonas.com/id227.html . Contemporary with this coin - which is the first coin of the official Vatican mint - the friend of Charlemagne King Offa of England minted a gold coin commemorating the muslems at Medina before the taking of Mecca http://www.nylicsocialworkeramazonas.com/id202.html .  This all happened in the 8th century A.D. I bought the coin at a flea market on the zocalo in Antigua Guatemala two years ago and donated it to the Antigua Guatemala San Francisco mission. Probably because of the earthquakes it was placed in the wall of a church being built since brought down by age and earthquakes.