A:
Pope St. Leo III (795-816) was a generally cautious man. For example, he forbade the addition of the filioque clause ('and the son') to the Nicene Creed, yet allowed its continued use.
During his reign as pope, Leo III was accused of adultery, perjury and other crimes. Charlemagne seems to have believed the accusations, but Leo cleared himself by an oath of purgation.
Pope Leo III was born in 750.
Pope Stephen IV was chosen after the death of Pope Leo III.
Pope Stephen IV followed the reign of Leo III.
Pope Leo III died on 816-06-12.
He was preceded by Pope Leo IV. Pope Nicholas I was the pope following Benedict III.
charlamagne/chareles the great
Leo's birth name is not known.
No, they are not the same person.
charlemagne
Leo the Great died of natural causes. He was not a martyr.
Pope Saint Leo III died of natural causes on June 12, 816, but the place of his death is not recorded. However, it was probably in Rome.
Pope Leo III crowned Charlemagne as Emperor of the Romans on December 25, 800 AD.