What happened on Christmas Day of 800 A. D. in Saint Peter’s Basilica in Rome?

Pope Leo III was crowned the Frankish king

Explanation:

the story goes that because of this belief, constantine was able to defeat his foes. constantine became an ardent1 christian. christianity and other religions were tolerated under constantine's rule. constantine also was responsible for the building of a great cathedral in rome.

it is the dominance of   the spanish language and roman catholic region in mexico, french being the official language of several african countries, and the existence of a western-style government in south asian countries