Answer:
Charlemagne spent the early part of his reign on several military campaigns to expand his kingdom. He invaded Saxony in 772 and eventually achieved its total conquest and conversion to Christianity. ... As a token of thanks, Leo crowned Charlemagne on Christmas Day that year, declaring him emperor of the Romans.
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In June of 1215, the answer itself is too short so I added this sentence
This conflict between religious and political leaders has been a constant theme throughout history and one of the most emblematic examples is the conflict between Pope Gregory VII, leader of the Roman Catholic Church and Emperor Henry IV, leader of the Holy Roman Empire. Hope this helped!
They're used by humans for fossil fuel and in entertainment. They were not created by the human race, they were created through thousands of being underground and soft tissues quickly decompose leaving the hard bones or shells behind. Over time sediment builds over the top and hardens into rock.