1917 article from the Journal of Negro History by Joseph Butsch, arguing that the Catholic church was crucial in ammeliorating the condition of slaves in the Americas.
An article looking at the Catholic church's nuanced attitude towards slavery - allowing it in some cases but condemning the harsher version practiced in America and the English colonies.
Pope Gregory I (c. 600) not only set free serfs subject to him but he awarded them the goods they held, and he put forward the strongest reason for his act. From the Medieval Sourcebook.
From Pope Gregory III in 731.
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