What forces influenced the spread of Christianity as the dominant religion during the middle ages from the fall of Rome in 476 C.E. to Emperor Charlemagne’s death in 814 C.E.?

What forces influenced the spread of Christianity as the dominant religion during the middle ages from the fall of Rome in 476 C.E. to Emperor Charlemagne’s death in 814 C.E.?

The sources must related to my research question and help me to answer it. Just the sources no annotations please πŸ™‚ there wasnt an option for just bibliography my professor doesnt want annotations.

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