Although it has been fashionable to deny it, anti-slavery doctrines began to appear in Christian theology soon after the decline of Rome and were accompanied by the eventual disappearance of slavery in all but the fringes of Christian Europe. When Europeans subsequently instituted slavery in the New World, they did so over strenuous papal opposition, a fact that was conveniently 'lost' from history until recently. Finally, the abolition of New World slavery was initiated and achieved by Christian activists.