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In page Catholic Church and slavery:

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The Church at times distinguished between various forms and elements of "slavery". These considered the making of slaves, or "new enslavement", trafficking and trading, and ownership. A distinction was made between "just" and "unjust" slavery, and whether a particular slave was "justly" or "unjustly" kept in that condition might depend on religious status. The church long accepted the right to sell oneself or one's children into slavery, at times fairly common, or to be sentenced to slavery as a criminal punishment. Slavery was long regarded as a matter of secular law.[citation needed]