Coifi was a pagan priest in early medieval England who played a key role in the conversion of King Edwin of Northumbria to Christianity. He was initially skeptical of the new religion, but after witnessing a demonstration of Christian power and hearing a persuasive argument from Bishop Paulinus, Coifi led the destruction of a pagan temple and symbolically demonstrated the rejection of his old beliefs.

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It is not known how Coifi was converted to Christianity. Very little is known about him. What is known is that he convinced king Edwin of Northumbria to convert to Christianity.

According to the Chronicle by Saint Bede, a monk in a monastery in Northumbria, Coifi convinced Edwin with the following words: "King, consider what this is which is now preached to us; for I verily declare to you that the religion which we have hitherto professed has, as afar as I can learn, no virtue in it. For none of you people has applied himself more diligently to the worship of our gods than I; and yet there are many who receive greater favours from you, and are more preferred than I, and who are more prosperous in all their undertakings. Now if the gods were good for anything, they would rather forward me, who have been more careful to serve them. If follows, therefore, that if upon examination you find those new doctrines which are now preached to us better and more efficacious, we should immediately receive them without any delay."

In his own words: "O king, consider what this is which is now preached to us; for I verily declare to you that the religion which we have hitherto professed has, as afar as I can learn, no virtue in it. For none of you people has applied himself more diligently to the worship of our gods than I; and yet there are many who receive greater favors from you, and are more preferred than I, and who are more prosperous in all their undertakings. Now if the gods were good for anything, they would rather forward me, who have been more careful to serve them. If follows, therefore, that if upon examination you find those new doctrines which are now preached to us better and more efficacious, we should immediately receive them without any delay."