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the Emperor Decius did a Empire-wide persecution causing thousands to fall away
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the council declared that the Trinity is doctrine
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the Nicene Creed the longer version of the apostle creed
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the emperor Theodosius kills thousands in Thessalonica and refuses communion
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Gregory the great was the first medieval pope
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Charles Martel , a Frankish general, stops an unstoppable Muslim invasion
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the Greek and Latin language split permanently
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the first crusade really damaged the relations with Christians and others
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when there are 3 pope at the same time the Roman Catholic Church loses power
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when Constantinople falls to the turks it ends a millennium of Christianity in the Byzantine empire
