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John IV
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Not who you're looking for? Others named John IV: Duke of Brabant, Lothier and Limburg and Count of Hainaut, H · bishop of Naples
Pope John IV (; died 12 October 642) was the bishop of Rome from 24 December 640 to his death. His election followed a four-month vacancy. He wrote to the clergy of Ireland and Scotland to tell them of the mistakes they were making with regard to the time of keeping Easter and condemned Monothelitism as heresy.
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