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This was the first step to Constantine becoming the sole ruler of the Roman Empire and was thefirst step of the Roman Empire becoming christian
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The Council of Nicaea untied christians and created the Creed of Nicaea. The council was created by Constantine and helped to unify christianity in the Empire
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Hagia Sophia was the eastern roman empire's main church and helped to create the Greek Orthodox branch of christianity.
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The Justinian plague killed up to 1/4 of the Eastern population and prevented Justinian from reuniting the Roman empire
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Charles Martel pushed the invading muslims back and preserved Europe for Christianity.
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