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In page Slavery in medieval Europe:

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As these peoples Christianized, the church worked more actively to reduce the practice of holding coreligionists in bondage.[7] St. Patrick, who himself was captured and enslaved at one time, protested an attack that enslaved newly baptized Christians in his letter to the soldiers of Coroticus.[3](p 43) The restoration of order and the growing power of the church slowly transmuted the late Roman slave system of Diocletian into serfdom.[citation needed]