Influenced by the German Bishop Wilhelm Emmanuel Freiherr von Ketteler, in 1891 Pope Leo XIII published the encyclical Rerum Novarum, which set in context Catholic social teaching in terms that rejected socialism but advocated the regulation of working conditions.
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In October 1873 the Mainz bishop and Centre Party founder Wilhelm Emmanuel Freiherr von Ketteler, having publicly condemned the May Laws on a pilgrimage to Kevelaer, was arrested and sentenced to two years in prison, resulting in fierce protests.