The Catholic Encyclopedia gives credit to Pope Julius I as the official designation of December 25th for the birth of Christ. This happened in 336 AD. Constantine had recognized that date before, but Julius I made it official. The chosen date was to coincide with the birth date of Mythras, the Roman sun god as a way of drawing the pagan religion away from their false god.
Pope Gregory
Before 400 AD Christmas was usually celebrated on December 21. Pope Julius 1 decided that Christmas would be celebrated on December 25.
No, Pope Gregory the Great .was also known as Pope Gregory I.
Pope Julius I
That would be Pope Saint Gregory I.
Pope St. Gregory VII was pope in 1075.Pope St. Gregory VII was pope in 1075.
Yes, Pope Gregory I was the 64th pope.
Pope Gregory I
Yes, he was also known as Pope Gregory the Great.
Pope Gregory VII was a Catholic pope. Of course he was a Christian.
Pope Gregory VII was elected pope on April 23, 1073.
Pope Gregory III was born in 690.