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AD
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leads the fight against the powerful Gnostic heresy.
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signaling a shift in Christians' life and practice.
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AD
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in his Easter Letter lists the current 27 books of the canon.
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refusing him Communion after his brutal killing of thousands in Thessalonica; the act influences church-state relations for generations.
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AD
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Frankish general Charles Martel halts the seemingly unstoppable Muslim invasion, keeping Europe under Christian control .
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The "Father of Western mysticism" strengthens the monastic tradition.
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passionate gospel, and later founds the Franciscan order.
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a treasure of Western mysticism, are begun.
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ending a millennium of Christianity in the Eastern Roman ("Byzantine") Empire.
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under Ferdinand and Isabella, begins against baptized Jews and Moors.